A military, also known collectively as armed forces, is a heavily
armed, highly organized force primarily intended for
warfare
War is an armed conflict between the armed forces of State (polity), states, or between governmental forces and armed groups that are organized under a certain command structure and have the capacity to sustain military operations, or betwe ...
. Militaries are typically authorized and maintained by a
sovereign state
A sovereign state is a State (polity), state that has the highest authority over a territory. It is commonly understood that Sovereignty#Sovereignty and independence, a sovereign state is independent. When referring to a specific polity, the ter ...
, with their members identifiable by a distinct
military uniform
A military uniform is a standardised clothing, dress worn by members of the armed forces and Paramilitary, paramilitaries of various nations.
Military dress and styles have gone through significant changes over the centuries, from colourful ...
. They may consist of one or more
military branch
Military branch (also service branch or armed service) is according to common standard a subdivision of the national armed forces of a sovereign nation or state.
Types of branches
Unified armed forces
The Canadian Armed Forces is the unifie ...
es such as an
army
An army, ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by ...
,
navy
A navy, naval force, military maritime fleet, war navy, or maritime force is the military branch, branch of a nation's armed forces principally designated for naval warfare, naval and amphibious warfare; namely, lake-borne, riverine, littoral z ...
,
air force
An air force in the broadest sense is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an army aviati ...
,
space force
A space force is a military branch of a nation's armed forces that conducts military operations in outer space and space warfare. The world's first space force was the Russian Space Forces, established in 1992 as an independent military service. ...
,
marines
Marines (or naval infantry) are military personnel generally trained to operate on both land and sea, with a particular focus on amphibious warfare. Historically, the main tasks undertaken by marines have included Raid (military), raiding ashor ...
, or
coast guard
A coast guard or coastguard is a Maritime Security Regimes, maritime security organization of a particular country. The term embraces wide range of responsibilities in different countries, from being a heavily armed military force with cust ...
. The main task of a military is usually defined as defence of their state and its interests against external armed threats.
In broad usage, the terms "armed forces" and "military" are often synonymous, although in technical usage a distinction is sometimes made in which a country's armed forces may include other
paramilitary
A paramilitary is a military that is not a part of a country's official or legitimate armed forces. The Oxford English Dictionary traces the use of the term "paramilitary" as far back as 1934.
Overview
Though a paramilitary is, by definiti ...
forces such as armed police.

Beyond warfare, the military may be employed in additional sanctioned and non-sanctioned functions within the state, including internal security threats,
crowd control
Crowd control is a public security practice in which large crowds are managed in order to prevent the outbreak of crowd crushes, affray, fights involving drunk and disorderly people or riots. Crowd crushes in particular can cause many hundre ...
, promotion of
political agenda
In politics, a political agenda is a list of subjects or problems (issues) to which government officials as well as individuals outside the government are paying serious attention to at any given time. The political agenda is most often shaped by ...
s,
emergency service
Emergency services and rescue services are organizations that ensure public safety, security, and health by addressing and resolving different emergencies. Some of these agencies exist solely for addressing certain types of emergencies, while oth ...
s and reconstruction, protecting
corporate
A corporation or body corporate is an individual or a group of people, such as an association or company, that has been authorized by the state to act as a single entity (a legal entity recognized by private and public law as "born out of s ...
economic interests, social ceremonies, and national
honour guards.
A nation's military may function as a discrete social
subculture
A subculture is a group of people within a culture, cultural society that differentiates itself from the values of the conservative, standard or dominant culture to which it belongs, often maintaining some of its founding principles. Subcultures ...
, with dedicated infrastructure such as military housing,
schools
A school is the educational institution (and, in the case of in-person learning, the building) designed to provide learning environments for the teaching of students, usually under the direction of teachers. Most countries have systems of ...
, utilities,
logistics
Logistics is the part of supply chain management that deals with the efficient forward and reverse flow of goods, services, and related information from the point of origin to the Consumption (economics), point of consumption according to the ...
,
hospitals
A hospital is a healthcare institution providing patient treatment with specialized health science and auxiliary healthcare staff and medical equipment. The best-known type of hospital is the general hospital, which typically has an emergency ...
, legal services, food production, finance, and banking services.
The profession of
soldier
A soldier is a person who is a member of an army. A soldier can be a Conscription, conscripted or volunteer Enlisted rank, enlisted person, a non-commissioned officer, a warrant officer, or an Officer (armed forces), officer.
Etymology
The wo ...
ing is older than
recorded history
Recorded history or written history describes the historical events that have been recorded in a written form or other documented communication which are subsequently evaluated by historians using the historical method. For broader world h ...
. Some images of
classical antiquity
Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural History of Europe, European history between the 8th century BC and the 5th century AD comprising the inter ...
portray the power and feats of military
leaders
Leadership, is defined as the ability of an individual, group, or organization to "", influence, or guide other individuals, teams, or organizations.
"Leadership" is a contested term. Specialist literature debates various viewpoints on the c ...
. The
Battle of Kadesh
The Battle of Kadesh took place in the 13th century BC between the New Kingdom of Egypt, Egyptian Empire led by pharaoh Ramesses II and the Hittites, Hittite Empire led by king Muwatalli II. Their armies engaged each other at the Orontes River, ...
in 1274 BC from the reign of
Ramses II
Ramesses II (sometimes written Ramses or Rameses) (; , , ; ), commonly known as Ramesses the Great, was an Pharaoh, Egyptian pharaoh. He was the third ruler of the Nineteenth Dynasty of Egypt, Nineteenth Dynasty. Along with Thutmose III of th ...
, features in
bas-relief
Relief is a sculptural method in which the sculpted pieces remain attached to a solid background of the same material. The term ''relief'' is from the Latin verb , to raise (). To create a sculpture in relief is to give the impression that th ...
monuments. The first
Emperor of a unified China,
Qin Shi Huang
Qin Shi Huang (, ; February 25912 July 210 BC), born Ying Zheng () or Zhao Zheng (), was the founder of the Qin dynasty and the first emperor of China. He is widely regarded as the first ever supreme leader of a unitary state, unitary d ...
, created the
Terracotta Army
The Terracotta Army is a collection of terracotta sculptures depicting the armies of Qin Shi Huang, the first emperor of China. It is a form of funerary art buried with the emperor in 210–209 BCE with the purpose of protecting him in his aft ...
to represent his military might.
[
Terra cotta of massed ranks of Qin Shi Huang's terra cotta soldiers
]
The
Ancient Romans
The Roman people was the ethnicity and the body of Roman citizenship, Roman citizens
(; ) during the Roman Kingdom, the Roman Republic, and the Roman Empire. This concept underwent considerable changes throughout the long history of the Roman ...
wrote many
treatise
A treatise is a Formality, formal and systematic written discourse on some subject concerned with investigating or exposing the main principles of the subject and its conclusions."mwod:treatise, Treatise." Merriam-Webster Online Dictionary. Acc ...
s and writings on warfare, as well as many decorated
triumphal arch
A triumphal arch is a free-standing monumental structure in the shape of an archway with one or more arched passageways, often designed to span a road, and usually standing alone, unconnected to other buildings. In its simplest form, a triumphal ...
es and
victory column
A victory column, or monumental column or triumphal column, is a monument in the form of a column, erected in memory of a heroic commemoration, including victorious battle, war, or revolution. The column typically stands on a base and is crowned ...
s.
Etymology and definitions
The first recorded use of the word "military" in English, spelled , was in 1582.
It comes from the Latin (from Latin ) through French, but is of uncertain etymology, one suggestion being derived from ''*mil-it-'' – going in a body or mass.
As a noun phrase, "the military" usually refers generally to a country's armed forces, or sometimes, more specifically, to the senior officers who command them.
In general, it refers to the physicality of armed forces, their
personnel
Employment is a relationship between two parties regulating the provision of paid labour services. Usually based on a contract, one party, the employer, which might be a corporation, a not-for-profit organization, a co-operative, or any othe ...
,
equipment
Equipment most commonly refers to a set of tool
A tool is an Physical object, object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many Tool use by ...
, and the physical area which they occupy.
As an adjective, military originally referred only to soldiers and soldiering, but it broadened to apply to land forces in general, and anything to do with their profession.
The names of both the
Royal Military Academy (1741) and
United States Military Academy
The United States Military Academy (USMA), commonly known as West Point, is a United States service academies, United States service academy in West Point, New York that educates cadets for service as Officer_(armed_forces)#United_States, comm ...
(1802) reflect this. However, at about the time of the
Napoleonic Wars
{{Infobox military conflict
, conflict = Napoleonic Wars
, partof = the French Revolutionary and Napoleonic Wars
, image = Napoleonic Wars (revision).jpg
, caption = Left to right, top to bottom:Battl ...
, ''military'' began to be used in reference to armed forces as a whole, such as "
military service
Military service is service by an individual or group in an army or other militia, air forces, and naval forces, whether as a chosen job (volunteer military, volunteer) or as a result of an involuntary draft (conscription).
Few nations, such ...
", "
military intelligence
Military intelligence is a military discipline that uses information collection and analysis List of intelligence gathering disciplines, approaches to provide guidance and direction to assist Commanding officer, commanders in decision making pr ...
", and "
military history
Military history is the study of War, armed conflict in the Human history, history of humanity, and its impact on the societies, cultures and economies thereof, as well as the resulting changes to Politics, local and international relationship ...
". As such, it now connotes any activity performed by armed force personnel.
History
Military history is often considered to be the history of all conflicts, not just the history of the state militaries. It differs somewhat from the
history of war, with military history focusing on the people and institutions of war-making, while the history of war focuses on the evolution of war itself in the face of changing technology, governments, and geography.
Military history has a number of facets. One main facet is to learn from past accomplishments and mistakes, so as to more effectively wage war in the future. Another is to create a sense of
military tradition
Military tradition is the practices associated with the military or soldiers such as the styles of military uniform, drill, or the music of a military unit.
In Europe
In Europe, tradition was a principle of military culture that had evolved out ...
, which is used to create cohesive military forces. Still, another is to learn to prevent wars more effectively. Human knowledge about the military is largely based on both recorded and
oral history
Oral history is the collection and study of historical information from
people, families, important events, or everyday life using audiotapes, videotapes, or transcriptions of planned interviews. These interviews are conducted with people who pa ...
of military conflicts (war), their participating
armies
An army, ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by ...
and
navies
A navy, naval force, military maritime fleet, war navy, or maritime force is the branch of a nation's armed forces principally designated for naval and amphibious warfare; namely, lake-borne, riverine, littoral, or ocean-borne combat operation ...
and, more recently,
air force
An air force in the broadest sense is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an army aviati ...
s.
Organization
Personnel and units
Despite the growing importance of
military technology
Military technology is the application of technology for use in warfare. It comprises the kinds of technology that are distinctly military in nature and not civilian in application, usually because they lack useful or legal civilian application ...
, military activity depends above all on people. For example, in 2000 the British Army declared: "Man is still the first weapon of war."
Rank and role
The military organization is characterized by a
command hierarchy
A command hierarchy is a group of people who carry out orders based on others' authority within the group.
Military chain of command
In a military context, the chain of command is the line of authority and responsibility along which orders ...
divided by
military rank
Military ranks is a system of hierarchy, hierarchical relationships within armed forces, police, Intelligence agency, intelligence agencies, paramilitary groups, and other institutions organized along military organisation , military lines, such ...
, with ranks normally grouped (in descending order of authority) as
officers (e.g.
colonel
Colonel ( ; abbreviated as Col., Col, or COL) is a senior military Officer (armed forces), officer rank used in many countries. It is also used in some police forces and paramilitary organizations.
In the 17th, 18th, and 19th centuries, a colon ...
),
non-commissioned officer
A non-commissioned officer (NCO) is an enlisted rank, enlisted leader, petty officer, or in some cases warrant officer, who does not hold a Commission (document), commission. Non-commissioned officers usually earn their position of authority b ...
s (e.g.
sergeant
Sergeant (Sgt) is a Military rank, rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, ''serjeant'', is used in The Rifles and in other units that draw their heritage f ...
), and personnel at the lowest rank (e.g.
private
Private or privates may refer to:
Music
* "In Private", by Dusty Springfield from the 1990 album ''Reputation''
* Private (band), a Denmark-based band
* "Private" (Ryōko Hirosue song), from the 1999 album ''Private'', written and also recorded ...
). While senior officers make strategic decisions, subordinated military personnel (
soldier
A soldier is a person who is a member of an army. A soldier can be a Conscription, conscripted or volunteer Enlisted rank, enlisted person, a non-commissioned officer, a warrant officer, or an Officer (armed forces), officer.
Etymology
The wo ...
s,
sailor
A sailor, seaman, mariner, or seafarer is a person who works aboard a watercraft as part of its crew, and may work in any one of a number of different fields that are related to the operation and maintenance of a ship. While the term ''sailor'' ...
s,
marines
Marines (or naval infantry) are military personnel generally trained to operate on both land and sea, with a particular focus on amphibious warfare. Historically, the main tasks undertaken by marines have included Raid (military), raiding ashor ...
, or
airmen) fulfil them. Although rank titles vary by
military branch
Military branch (also service branch or armed service) is according to common standard a subdivision of the national armed forces of a sovereign nation or state.
Types of branches
Unified armed forces
The Canadian Armed Forces is the unifie ...
and country, the rank hierarchy is common to all state armed forces worldwide.
In addition to their rank, personnel occupy one of many trade roles, which are often grouped according to the nature of the role's military tasks on combat operations:
combat
Combat (French language, French for ''fight'') is a purposeful violent Conflict (process), conflict between multiple combatants with the intent to harm the opposition. Combat may be armed (using weapons) or unarmed (Hand-to-hand combat, not usin ...
roles (e.g.
infantry
Infantry, or infantryman are a type of soldier who specialize in ground combat, typically fighting dismounted. Historically the term was used to describe foot soldiers, i.e. those who march and fight on foot. In modern usage, the term broadl ...
),
combat support roles (e.g.
combat engineer
A combat engineer (also called pioneer or sapper) is a type of soldier who performs military engineering tasks in support of land forces combat operations. Combat engineers perform a variety of military engineering, Tunnel warfare, tunnel and l ...
s), and
combat service support
The term combat service support (or CSS) is utilized by numerous military organizations throughout the world to describe entities that provide direct and indirect sustainment services to the groups that engage (or are potentially to be engaged) ...
roles (e.g.
logistical support).
Recruitment
Personnel may be
recruited or
conscripted
Conscription, also known as the draft in the United States and Israel, is the practice in which the compulsory enlistment in a national service, mainly a military service, is enforced by law. Conscription dates back to antiquity and it contin ...
, depending on the system chosen by the state. Most military personnel are males; the minority proportion of female personnel varies internationally (approximately 3% in India, 10% in the UK, 13% in Sweden, 16% in the US, and 27% in South Africa). While two-thirds of states now recruit or conscript only adults, as of 2017 50 states still relied partly on children under the age of 18 (usually aged 16 or 17) to staff their armed forces.
Whereas recruits who join as
officers tend to be
upwardly-mobile,
most enlisted personnel have a childhood background of relative
socio-economic deprivation.
[Brett, Rachel, and Irma Specht. ''Young Soldiers: Why They Choose to Fight''. Boulder: ]Lynne Rienner Publishers
Lynne Rienner Publishers is an independent scholarly and textbook publishing firm based in Boulder, Colorado. It was founded in 1984 and remains one of the few independent publishers in the United States.
It publishes primarily in the fields of ...
, 2004. For example, after the US suspended conscription in 1973, "the military disproportionately attracted African American men, men from lower-status socioeconomic backgrounds, men who had been in nonacademic high school programs, and men whose high school grades tended to be low".
However, a study released in 2020 on the socio-economic backgrounds of U.S. Armed Forces personnel suggests that they are at parity or slightly higher than the civilian population with respect to socio-economic indicators such as parental income, parental wealth and cognitive abilities. The study found that technological, tactical, operational and doctrinal changes have led to a change in the demand for personnel. Furthermore, the study suggests that the most disadvantaged socio-economic groups are less likely to meet the requirements of the modern U.S. military.
Obligations
The obligations of military employment are many. Full-time military employment normally requires a minimum period of service of several years; between two and six years is typical of armed forces in Australia, the UK and the US, for example, depending on role, branch, and rank.
Some armed forces allow a short
discharge window, normally during training, when recruits may leave the armed force as of right.
Alternatively, part-time military employment, known as
reserve service, allows a recruit to maintain a civilian job while training under military discipline at weekends; he or she may be called out to
deploy on operations to supplement the full-time personnel complement. After leaving the armed forces, recruits may remain liable for compulsory return to full-time military employment in order to train or
deploy on operations.
Military law
Military justice (or military law) is the body of laws and procedures governing members of the armed forces. Many nation-states have separate and distinct bodies of law that govern the conduct of members of their armed forces. Some states us ...
introduces offences not recognized by civilian courts, such as
absence without leave (AWOL), desertion, political acts,
malingering
Malingering is the fabrication, feigning, or exaggeration of physical or psychological symptoms designed to achieve a desired outcome, such as personal gain, relief from duty or work, avoiding arrest, receiving medication, or mitigating prison se ...
, behaving disrespectfully, and disobedience (see, for example,
offences against military law in the United Kingdom
The main Offences against military law in the United Kingdom are set out in the Armed Forces Act 2006.
The offences fall into two main categories, discipline offences and criminal conduct offences. A second distinction is between those offences ...
).
Penalties range from a summary
reprimand to imprisonment for several years following a
court martial
A court-martial (plural ''courts-martial'' or ''courts martial'', as "martial" is a postpositive adjective) is a military court or a trial conducted in such a court. A court-martial is empowered to determine the guilt of members of the mili ...
.
Certain rights are also restricted or suspended, including the freedom of association (e.g. union organizing) and freedom of speech (speaking to the media).
Military personnel in some countries have a right of
conscientious objection
A conscientious objector is an "individual who has claimed the right to refuse to perform military service" on the grounds of freedom of conscience or religion. The term has also been extended to objecting to working for the military–indu ...
if they believe an order is immoral or unlawful, or cannot in good conscience carry it out.
Personnel may be posted to bases in their home country or overseas, according to operational need, and may be deployed from those bases on
exercises or
operations. During peacetime, when military personnel are generally stationed in
garrison
A garrison is any body of troops stationed in a particular location, originally to guard it. The term now often applies to certain facilities that constitute a military base or fortified military headquarters.
A garrison is usually in a city ...
s or other permanent military facilities, they conduct administrative tasks,
training
Training is teaching, or developing in oneself or others, any skills and knowledge or fitness that relate to specific useful competencies. Training has specific goals of improving one's capability, capacity, productivity and performance. I ...
and
education
Education is the transmission of knowledge and skills and the development of character traits. Formal education occurs within a structured institutional framework, such as public schools, following a curriculum. Non-formal education als ...
activities,
technology maintenance,
and recruitment.
Training
Initial training conditions recruits for the demands of military life, including preparedness to injure and kill other people, and to face mortal danger without fleeing. It is a physically and psychologically intensive process which
resocializes recruits for the unique nature of military demands. For example:
* Individuality is suppressed (e.g. by shaving the head of new recruits, issuing uniforms, denying privacy, and prohibiting the use of first names);
* Daily routine is tightly controlled (e.g. recruits must make their beds, polish boots, and stack their clothes in a certain way, and mistakes are punished);
* Continuous
stressor
A stressor is a chemical or biological agent, environmental condition, external stimulus or an event seen as causing stress to an organism. Psychologically speaking, a stressor can be events or environments that individuals might consider dema ...
s deplete psychological resistance to the demands of their instructors (e.g. depriving recruits of sleep, food, or shelter, shouting insults and giving orders intended to humiliate)
* Frequent punishments serve to condition group conformity and discourage poor performance;
* The disciplined drill instructor is presented as a role model of the ideal soldier.
Intelligence
The next requirement comes as a fairly basic need for the military to identify possible
threats it may be called upon to face. For this purpose, some of the commanding forces and other military, as well as often civilian personnel participate in identification of these threats. This is at once an organization, a system and a process collectively called
military intelligence
Military intelligence is a military discipline that uses information collection and analysis List of intelligence gathering disciplines, approaches to provide guidance and direction to assist Commanding officer, commanders in decision making pr ...
(MI). Areas of study in Military intelligence may include the operational environment, hostile, friendly and neutral forces, the civilian population in an area of combat operations, and other broader areas of interest.
The difficulty in using military intelligence concepts and military intelligence methods is in the nature of the
secrecy
Secrecy is the practice of hiding information from certain individuals or groups who do not have the "need to know", perhaps while sharing it with other individuals. That which is kept hidden is known as the secret.
Secrecy is often controver ...
of the information they seek, and the
clandestine nature that intelligence operatives work in obtaining what may be plans for a
conflict escalation,
initiation of combat, or an
invasion
An invasion is a Offensive (military), military offensive of combatants of one geopolitics, geopolitical Legal entity, entity, usually in large numbers, entering territory (country subdivision), territory controlled by another similar entity, ...
.
An important part of the military intelligence role is the military analysis performed to assess
military capability
Military capability is defined by the Australian Defence Force as "the ability to achieve a desired effect in a specific operating environment". It is defined by three interdependent factors: combat readiness, sustainable capability and force struc ...
of potential future aggressors, and provide combat modelling that helps to understand factors on which comparison of forces can be made. This helps to quantify and qualify such statements as: "
China
China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
and
India
India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
maintain the largest armed forces in the World" or that "the
U.S. Military is considered to be the world's strongest".

Although some groups engaged in combat, such as militants or
resistance movement
A resistance movement is an organized group of people that tries to resist or try to overthrow a government or an occupying power, causing disruption and unrest in civil order and stability. Such a movement may seek to achieve its goals through ei ...
s, refer to themselves using military terminology, notably 'Army' or 'Front', none have had the structure of a national military to justify the reference, and usually have had to rely on support of outside national militaries. They also use these terms to conceal from the MI their true capabilities, and to impress potential ideological recruits.
Having military intelligence representatives participate in the execution of the national defence policy is important, because it becomes the first respondent and commentator on the policy expected
strategic goal, compared to the realities of
identified threats. When the intelligence reporting is compared to the policy, it becomes possible for the national leadership to consider allocating resources over and above the officers and their subordinates military pay, and the expense of maintaining military facilities and military support services for them.
Budget
Defense economics is the financial and monetary efforts made to resource and sustain militaries, and to finance
military operation
A military operation (op) is the coordinated military actions of a state, or a non-state actor, in response to a developing situation. These actions are designed as a military plan to resolve the situation in the state or actor's favor. Operati ...
s, including war.
The process of allocating resources is conducted by determining a
military budget
A military budget (or military expenditure), also known as a defense budget, is the amount of financial resources dedicated by a state to raising and maintaining an armed forces or other methods essential for defense purposes.
Financing milita ...
, which is administered by a military finance organization within the military. Military procurement is then authorized to purchase or contract provision of goods and services to the military, whether in peacetime at a permanent base, or in a combat zone from local population.
File:Military Expenditures by Country 2019.svg, A pie chart showing global military expenditures by country for 2019, in US$ billions, according to SIPRI
File:Military Expenditures as percent of GDP 2017.png, Map of military expenditures as a percentage of GDP
Gross domestic product (GDP) is a monetary measure of the total market value of all the final goods and services produced and rendered in a specific time period by a country or countries. GDP is often used to measure the economic performance o ...
by country, 2017
File:U.S - China - Russia, Military Spending.svg, History of military budgets by country
Capability development
Capability development, which is often referred to as the military 'strength', is arguably one of the most complex activities known to humanity; because it requires determining: strategic, operational, and tactical capability requirements to counter the identified threats; strategic,
operational, and tactical doctrines by which the acquired capabilities will be used; identifying concepts, methods, and systems involved in executing the doctrines; creating design specifications for the manufacturers who would produce these in adequate quantity and quality for their use in combat; purchase the concepts, methods, and systems; create a forces structure that would use the concepts, methods, and systems most effectively and efficiently; integrate these concepts, methods, and systems into the force structure by providing
military education
Military education and training is a process which intends to establish and improve the capabilities of military personnel in their respective roles. Military training may be voluntary or compulsory duty. It begins with recruit training, proceed ...
,
training
Training is teaching, or developing in oneself or others, any skills and knowledge or fitness that relate to specific useful competencies. Training has specific goals of improving one's capability, capacity, productivity and performance. I ...
, and
practice that preferably resembles combat environment of intended use; create
military logistics
Military logistics is the discipline of planning and carrying out the movement, supply, and maintenance of military forces. In its most comprehensive sense, it is those aspects or military operations that deal with:
* Design, development, Milita ...
systems to allow continued and uninterrupted performance of
military organization
Military organization (American English , AE) or military organisation (British English , BE) is the structuring of the armed forces of a State (polity), state so as to offer such military capability as a military policy, national defense pol ...
s under combat conditions, including provision of health services to the personnel, and maintenance for the equipment; the services to assist recovery of wounded personnel, and repair of damaged equipment; and finally, post-conflict
demobilization
Demobilization or demobilisation (see American and British English spelling differences, spelling differences) is the process of standing down a nation's armed forces from combat-ready status. This may be as a result of victory in war, or becaus ...
, and disposal of war stocks surplus to peacetime requirements.
Development of
military doctrine
Military doctrine is the expression of how military forces contribute to campaigns, major operations, battles, and engagements. A military doctrine outlines what military means should be used, how forces should be structured, where forces shou ...
is perhaps the most important of all capability development activities, because it determines how military forces are used in conflicts, the concepts and methods used by the command to employ appropriately military skilled,
armed and
equipped personnel in achievement of the tangible goals and objectives of the
war
War is an armed conflict between the armed forces of states, or between governmental forces and armed groups that are organized under a certain command structure and have the capacity to sustain military operations, or between such organi ...
,
campaign,
battle
A battle is an occurrence of combat in warfare between opposing military units of any number or size. A war usually consists of multiple battles. In general, a battle is a military engagement that is well defined in duration, area, and force co ...
, engagement, and action.
[Dupuy, T.N. (1990) ''Understanding war: History and Theory of combat'', Leo Cooper, London, p. 67] The line between strategy and tactics is not easily blurred, although deciding which is being discussed had sometimes been a matter of personal judgement by some commentators, and military historians. The use of forces at the level of organization between strategic and tactical is called
operational mobility
In the field of military theory, the operational level of war (also called operational art, as derived from , or operational warfare) represents the level of command that connects the details of tactics with the goals of strategy.
In U.S. ...
.
Science

Because most of the concepts and methods used by the military, and many of its systems are not found in commercial branches, much of the material is researched, designed, developed, and offered for inclusion in
arsenal
An arsenal is a place where arms and ammunition are made, maintained and repaired, stored, or issued, in any combination, whether privately or publicly owned. Arsenal and armoury (British English) or armory (American English) are mostly ...
s by
military science
Military science is the study of military processes, institutions, and behavior, along with the study of warfare, and the theory and application of organized coercive force. It is mainly focused on theory, method, and practice of producing mi ...
organizations within the overall structure of the military. Therefore, military scientists can be found interacting with all Arms and Services of the armed forces, and at all levels of the military hierarchy of command.
Although concerned with research into
military psychology, particularly
combat stress and how it affects troop
morale
Morale ( , ) is the capacity of a group's members to maintain belief in an institution or goal, particularly in the face of opposition or hardship. Morale is often referenced by authority figures as a generic value judgment of the willpower, ...
, often the bulk of military science activities is directed at military intelligence technology,
military communications
Military communications or military signals involve all aspects of communications, or conveyance of information, by armed forces. Examples from '' Jane's Military Communications'' include text, audio, facsimile, tactical ground-based communica ...
, and improving
military capability
Military capability is defined by the Australian Defence Force as "the ability to achieve a desired effect in a specific operating environment". It is defined by three interdependent factors: combat readiness, sustainable capability and force struc ...
through research. The design, development, and prototyping of
weapon
A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law ...
s, military support equipment, and
military technology
Military technology is the application of technology for use in warfare. It comprises the kinds of technology that are distinctly military in nature and not civilian in application, usually because they lack useful or legal civilian application ...
in general, is also an area in which much effort is invested – it includes everything from global communication networks and
aircraft carrier
An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering carrier-based aircraft, shipborne aircraft. Typically it is the ...
s to paint and food.
Logistics

Possessing military capability is not sufficient if this capability cannot be deployed for, and employed in combat operations. To achieve this,
military logistics
Military logistics is the discipline of planning and carrying out the movement, supply, and maintenance of military forces. In its most comprehensive sense, it is those aspects or military operations that deal with:
* Design, development, Milita ...
are used for the
logistics management
Logistics is the part of supply chain management that deals with the efficient forward and reverse flow of goods, services, and related information from the point of origin to the point of consumption according to the needs of customers. Logi ...
and logistics planning of the forces
military supply chain management
Military supply-chain management is a cross-functional approach to procuring, producing and delivering products and services for military materiel applications. Military supply chain management includes sub-suppliers, suppliers, internal in ...
, the consumables, and capital equipment of the troops.
Although mostly concerned with the
military transport, as a means of delivery using different modes of transport; from
military truck
A military vehicle is any vehicle for land-based military transport and activity, including combat vehicles, both specifically designed for or significantly used by military. Most military vehicles require off-road capabilities and/or vehicle a ...
s, to
container ship
A container ship (also called boxship or spelled containership) is a cargo ship that carries all of its load in truck-size intermodal containers, in a technique called containerization. Container ships are a common means of commercial intermodal ...
s operating from permanent
military base
A military base is a facility directly owned and operated by or for the military or one of its branches that shelters military equipment and personnel, and facilitates training and operations. A military base always provides accommodations for ...
, it also involves creating field supply dumps at the rear of the
combat
Combat (French language, French for ''fight'') is a purposeful violent Conflict (process), conflict between multiple combatants with the intent to harm the opposition. Combat may be armed (using weapons) or unarmed (Hand-to-hand combat, not usin ...
zone, and even forward supply points in a specific unit's
tactical area of responsibility.
These supply points are also used to provide
military engineering
Military engineering is loosely defined as the art, science, and practice of designing and building military works and maintaining lines of military transport and military communications. Military engineers are also responsible for logistics b ...
services, such as the recovery of defective and derelict vehicles and weapons, maintenance of weapons in the field, the repair and field modification of weapons and equipment; and in peacetime, the life-extension programmes undertaken to allow continued use of equipment. One of the most important role of logistics is the supply of
munition
Ammunition, also known as ammo, is the material fired, scattered, dropped, or detonated from any weapon or weapon system. The term includes both expendable weapons (e.g., bombs, missiles, grenades, land mines), and the component parts of oth ...
s as a primary type of consumable, their storage, and
disposal.
In combat
The primary reason for the existence of the military is to engage in
combat
Combat (French language, French for ''fight'') is a purposeful violent Conflict (process), conflict between multiple combatants with the intent to harm the opposition. Combat may be armed (using weapons) or unarmed (Hand-to-hand combat, not usin ...
, should it be required to do so by the national defence policy, and to win. This represents an organisational goal of any military, and the primary focus for military thought through
military history
Military history is the study of War, armed conflict in the Human history, history of humanity, and its impact on the societies, cultures and economies thereof, as well as the resulting changes to Politics, local and international relationship ...
. How
victory
The term victory (from ) originally applied to warfare, and denotes success achieved in personal duel, combat, after military operations in general or, by extension, in any competition. Success in a military campaign constitutes a strategic vi ...
is achieved, and what shape it assumes, is studied by most, if not all, military groups on three levels.
Strategic victory
Military strategy
Military strategy is a set of ideas implemented by military organizations to pursue desired Strategic goal (military), strategic goals. Derived from the Greek language, Greek word ''strategos'', the term strategy, when first used during the 18th ...
is the management of forces in
war
War is an armed conflict between the armed forces of states, or between governmental forces and armed groups that are organized under a certain command structure and have the capacity to sustain military operations, or between such organi ...
s and
military campaign
A military campaign is large-scale long-duration significant military strategy plan incorporating a series of interrelated military operations or battles forming a distinct part of a larger conflict often called a war. The term derives from th ...
s by a
commander-in-chief, employing large military forces, either national and allied as a whole, or the component elements of
armies
An army, ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by ...
,
navies
A navy, naval force, military maritime fleet, war navy, or maritime force is the branch of a nation's armed forces principally designated for naval and amphibious warfare; namely, lake-borne, riverine, littoral, or ocean-borne combat operation ...
and
air force
An air force in the broadest sense is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an army aviati ...
s; such as
army group
An army group is a military organization consisting of several field army, field armies, which is self-sufficient for indefinite periods. It is usually responsible for a particular geographic area. An army group is the largest field organizatio ...
s,
naval fleet
A fleet or naval fleet is a large formation of warships – the largest formation in any navy – controlled by one leader. A fleet at sea is the direct equivalent of an army on land.
Purpose
In the modern sense, fleets are usually, but no ...
s, and large numbers of
aircraft
An aircraft ( aircraft) is a vehicle that is able to flight, fly by gaining support from the Atmosphere of Earth, air. It counters the force of gravity by using either Buoyancy, static lift or the Lift (force), dynamic lift of an airfoil, or, i ...
. Military strategy is a long-term projection of belligerents' policy, with a broad view of outcome implications, including outside the concerns of military command. Military strategy is more concerned with the
supply of war and planning, than management of field forces and combat between them. The scope of strategic military planning can span weeks, but is more often months or even years.
Operational victory
Operational mobility
In the field of military theory, the operational level of war (also called operational art, as derived from , or operational warfare) represents the level of command that connects the details of tactics with the goals of strategy.
In U.S. ...
is, within
war
War is an armed conflict between the armed forces of states, or between governmental forces and armed groups that are organized under a certain command structure and have the capacity to sustain military operations, or between such organi ...
fare and
military doctrine
Military doctrine is the expression of how military forces contribute to campaigns, major operations, battles, and engagements. A military doctrine outlines what military means should be used, how forces should be structured, where forces shou ...
, the level of command which coordinates the minute details of
tactics
Tactic(s) or Tactical may refer to:
* Tactic (method), a conceptual action implemented as one or more specific tasks
** Military tactics, the disposition and maneuver of units on a particular sea or battlefield
** Chess tactics
In chess, a tac ...
with the overarching goals of
strategy
Strategy (from Greek στρατηγία ''stratēgia'', "troop leadership; office of general, command, generalship") is a general plan to achieve one or more long-term or overall goals under conditions of uncertainty. In the sense of the " a ...
. A common synonym is operational art.
The operational level is at a scale bigger than one where line of sight and the time of day are important, and smaller than the strategic level, where production and politics are considerations. Formations are of the operational level if they are able to conduct operations on their own, and are of sufficient size to be directly handled or have a significant impact at the strategic level. This concept was pioneered by the
German
German(s) may refer to:
* Germany, the country of the Germans and German things
**Germania (Roman era)
* Germans, citizens of Germany, people of German ancestry, or native speakers of the German language
** For citizenship in Germany, see also Ge ...
army prior to and during the
Second World War
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. At this level, planning and duration of activities takes from one week to a month, and are executed by
Field Armies and
Army Corps
Corps (; plural ''corps'' ; from French , from the Latin "body") is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was formally introduced March 1, 1800, when Napoleon ordered Gener ...
and their naval and air equivalents.
Tactical victory
Military tactics
Military tactics encompasses the art of organizing and employing fighting forces on or near the battlefield. They involve the application of four battlefield functions which are closely related – kinetic or firepower, Mobility (military), mobil ...
concerns itself with the methods for engaging and defeating the enemy in direct combat. Military tactics are usually used by units over hours or days, and are focused on the specific tasks and objectives of
squadrons,
companies
A company, abbreviated as co., is a legal entity representing an association of legal people, whether natural, juridical or a mixture of both, with a specific objective. Company members share a common purpose and unite to achieve specifi ...
,
battalion
A battalion is a military unit, typically consisting of up to one thousand soldiers. A battalion is commanded by a lieutenant colonel and subdivided into several Company (military unit), companies, each typically commanded by a Major (rank), ...
s,
regiment
A regiment is a military unit. Its role and size varies markedly, depending on the country, military service, service, or administrative corps, specialisation.
In Middle Ages, Medieval Europe, the term "regiment" denoted any large body of l ...
s,
brigade
A brigade is a major tactical military unit, military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute ...
s, and
divisions
Division may refer to:
Mathematics
*Division (mathematics), the inverse of multiplication
* Division algorithm, a method for computing the result of mathematical division Military
*Division (military), a formation typically consisting of 10,000 t ...
, and their naval and air force equivalents.
One of the oldest military publications is ''
The Art of War
''The Art of War'' is an ancient Chinese military treatise dating from the late Spring and Autumn period (roughly 5th century BC). The work, which is attributed to the ancient Chinese military strategist Sun Tzu ("Master Sun"), is compos ...
'', by the
Chinese philosopher
Chinese philosophy (simplified Chinese: 中国哲学; traditional Chinese: 中國哲學) refers to the philosophical traditions that originated and developed within the historical and cultural context of China. It encompasses systematic reflec ...
Sun Tzu
Sun Tzu (; zh, t=孫子, s=孙子, first= t, p=Sūnzǐ) may have been a Chinese General, military general, strategist, philosopher, and writer who lived during the Eastern Zhou period (771–256 BC). Sun Tzu is traditionally credited as the au ...
. Written in the 6th century BCE, the 13-chapter book is intended as military instruction, and not as
military theory
Military theory is the study of the theories which define, inform, guide and explain war and warfare. Military theory analyses both normative behavioral phenomena and explanatory causal aspects to better understand war and how it is fought. It ...
, but has had a huge influence on Asian military doctrine, and from the late 19th century, on European and United States
military plan
A military operation plan (commonly called a war plan before World War II) is a formal plan for military armed forces, their military organizations and units to conduct operations, as drawn up by commanders within the combat operations process ...
ning. It has even been used to formulate business tactics, and can even be applied in social and political areas.

The Classical Greeks and the Romans wrote prolifically on
military campaign
A military campaign is large-scale long-duration significant military strategy plan incorporating a series of interrelated military operations or battles forming a distinct part of a larger conflict often called a war. The term derives from th ...
ing. Among the best-known Roman works are
Julius Caesar
Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in Caesar's civil wa ...
's commentaries on the
Gallic Wars
The Gallic Wars were waged between 58 and 50 BC by the Roman general Julius Caesar against the peoples of Gaul (present-day France, Belgium, and Switzerland). Gauls, Gallic, Germanic peoples, Germanic, and Celtic Britons, Brittonic trib ...
, and the
Roman Civil war
This list of Roman civil wars and revolts includes civil wars and organized civil disorder, revolts, and rebellions in ancient Rome (Roman Kingdom, Roman Republic, and Roman Empire) until the fall of the Western Roman Empire (753 BC – AD 476). ...
– written about 50 BC.
Two major works on tactics come from the late Roman period: ''Taktike Theoria'' by
Aelianus Tacticus
Aelianus Tacticus (; fl. 2nd century AD), also known as Aelian (), was a Greek military writer who lived in Rome.
Work
Aelian's military treatise in fifty-three chapters on the tactics of the Greeks, titled ''On Tactical Arrays of the Greeks'' ( ...
, and ''
De Re Militari'' ('On military matters') by
Vegetius
Publius (or Flavius) Vegetius Renatus, known as Vegetius (), was a writer of the Later Roman Empire (late 4th century). Nothing is known of his life or station beyond what is contained in his two surviving works: ''Epitoma rei militaris'' (also r ...
. ''Taktike Theoria'' examined Greek military tactics, and was most influential in the
Byzantine
The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
world and during the
Golden Age of Islam.
''De Re Militari'' formed the basis of European military tactics until the late 17th century. Perhaps its most enduring maxim is
''Igitur qui desiderat pacem, praeparet bellum'' (let he who desires peace prepare for war).
Due to the changing nature of combat with the introduction of
artillery
Artillery consists of ranged weapons that launch Ammunition, munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, and l ...
in the European
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and ...
, and infantry firearms in the
Renaissance
The Renaissance ( , ) is a Periodization, period of history and a European cultural movement covering the 15th and 16th centuries. It marked the transition from the Middle Ages to modernity and was characterized by an effort to revive and sur ...
, attempts were made to define and identify those strategies,
grand tactics, and tactics that would produce a victory more often than that achieved by the Romans in praying to the gods before the battle.
Later this became known as
military science
Military science is the study of military processes, institutions, and behavior, along with the study of warfare, and the theory and application of organized coercive force. It is mainly focused on theory, method, and practice of producing mi ...
, and later still, would adopt the
scientific method
The scientific method is an Empirical evidence, empirical method for acquiring knowledge that has been referred to while doing science since at least the 17th century. Historically, it was developed through the centuries from the ancient and ...
approach to the conduct of military operations under the influence of the
Industrial Revolution
The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a transitional period of the global economy toward more widespread, efficient and stable manufacturing processes, succee ...
thinking. In his seminal book ''
On War
''Vom Kriege'' () is a book on war and military strategy by Prussian general Carl von Clausewitz (1780–1831), written mostly after the Napoleonic wars, between 1816 and 1830, and published posthumously by his wife Marie von Brühl in 1832. It ...
'', the
Prussia
Prussia (; ; Old Prussian: ''Prūsija'') was a Germans, German state centred on the North European Plain that originated from the 1525 secularization of the Prussia (region), Prussian part of the State of the Teutonic Order. For centuries, ...
n
Major-General and leading
expert
An expert is somebody who has a broad and deep understanding and competence in terms of knowledge, skill and experience through practice and education in a particular field or area of study. Informally, an expert is someone widely recognized ...
on modern
military strategy
Military strategy is a set of ideas implemented by military organizations to pursue desired Strategic goal (military), strategic goals. Derived from the Greek language, Greek word ''strategos'', the term strategy, when first used during the 18th ...
,
Carl von Clausewitz
Carl Philipp Gottlieb von Clausewitz ( , ; born Carl Philipp Gottlieb Clauswitz; 1 July 1780 – 16 November 1831) was a Kingdom of Prussia, Prussian general and Military theory, military theorist who stressed the "moral" (in modern terms meani ...
defined military strategy as 'the employment of battles to gain the end of war'. According to Clausewitz:
strategy forms the plan of the War, and to this end it links together the series of acts which are to lead to the final decision, that is to say, it makes the plans for the separate campaigns and regulates the combats to be fought in each.
Hence, Clausewitz placed political aims above
military goals, ensuring
civilian control of the military
Civil control of the military is a doctrine in military science, military and political science that places ultimate command responsibility, responsibility for a country's Grand strategy, strategic decision-making in the hands of the state's c ...
. Military strategy was one of a triumvirate of '
arts
The arts or creative arts are a vast range of human practices involving creativity, creative expression, storytelling, and cultural participation. The arts encompass diverse and plural modes of thought, deeds, and existence in an extensive ...
' or 'sciences' that governed the conduct of warfare, the others being:
military tactics
Military tactics encompasses the art of organizing and employing fighting forces on or near the battlefield. They involve the application of four battlefield functions which are closely related – kinetic or firepower, Mobility (military), mobil ...
, the execution of plans and
manoeuvring of forces in battle, and maintenance of an army.

The meaning of military tactics has changed over time; from the deployment and manoeuvring of entire land armies on the fields of ancient battles, and galley fleets; to modern use of small unit
ambush
An ambush is a surprise attack carried out by people lying in wait in a concealed position. The concealed position itself or the concealed person(s) may also be called an "". Ambushes as a basic military tactics, fighting tactic of soldi ...
es,
encirclement
Encirclement is a military term for the situation when a force or target is isolated and surrounded by enemy forces. The situation is highly dangerous for the encircled force. At the military strategy, strategic level, it cannot receive Milit ...
s,
bombardment
A bombardment is an attack by artillery fire or by dropping bombs from aircraft on fortifications, combatants, or cities and buildings.
Prior to World War I, the term was only applied to the bombardment of defenseless or undefended obje ...
attacks,
frontal assault
A frontal assault is a military tactic which involves a direct, full-force attack on the front line of an enemy force, rather than to the flanks or rear of the enemy. It allows for a quick and decisive victory, but at the cost of subjecting the a ...
s,
air assault
Air assault is the movement of ground-based military forces by vertical take-off and landing (VTOL) aircraft, such as helicopters, to seize and hold key terrain that has not been fully secured, and to directly engage enemy forces behind enemy l ...
s,
hit-and-run tactics
Hit-and-run tactics are a Military tactics, tactical doctrine of using short surprise attacks, withdrawing before the enemy can respond in force, and constantly maneuvering to avoid full engagement with the enemy. The purpose is not to decisive ...
used mainly by
guerrilla
Guerrilla warfare is a form of unconventional warfare in which small groups of irregular military, such as rebels, Partisan (military), partisans, paramilitary personnel or armed civilians, which may include Children in the military, recruite ...
forces, and, in some cases,
suicide attack
A suicide attack (also known by a wide variety of other names, see below) is a deliberate attack in which the perpetrators knowingly sacrifice their own lives as part of the attack. These attacks are a form of murder–suicide that is ofte ...
s on land and at sea. Evolution of
aerial warfare
Aerial warfare is the use of military aircraft and other flying machines in warfare. Aerial warfare includes bombers attacking tactical bombing, enemy installations or a concentration of enemy troops or Strategic bombing, strategic targets; fi ...
introduced its own
air combat tactics. Often,
military deception
Military deception (MILDEC) is an attempt by a military unit to gain an advantage during warfare by misleading adversary decision makers into taking action or inaction that creates favorable conditions for the deceiving force. This is usually ...
, in the form of
military camouflage
Military camouflage is the use of camouflage by an Military, armed force to protect personnel and equipment from observation by enemy forces. In practice, this means applying colour and materials to military equipment of all kinds, including ...
or misdirection using
decoy
A decoy (derived from the Dutch ''de'' ''kooi'', literally "the cage" or possibly ''eenden kooi'', " duck cage") is usually a person, device, or event which resembles what an individual or a group might be looking for, but it is only meant to ...
s, is used to confuse the enemy as a tactic.
A major development in
infantry tactics
Infantry tactics are the combination of military concepts and methods used by infantry to achieve tactical objectives during combat. The role of the infantry on the battlefield is, typically, to close with and engage the enemy, and hold territo ...
came with the increased use of
trench warfare
Trench warfare is a type of land warfare using occupied lines largely comprising Trench#Military engineering, military trenches, in which combatants are well-protected from the enemy's small arms fire and are substantially sheltered from a ...
in the 19th and 20th centuries. This was mainly employed in
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
in the
Gallipoli campaign, and the
Western Front. Trench warfare often turned to a stalemate, only broken by a large loss of life, because, in order to attack an enemy entrenchment, soldiers had to run through an exposed '
no man's land' under heavy fire from their opposing entrenched enemy.
Technology

As with any occupation, since ancient times, the military has been distinguished from other members of the society by their tools: the
weapon
A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law ...
s and
military equipment
A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a d ...
used in combat. When
Stone Age
The Stone Age was a broad prehistory, prehistoric period during which Rock (geology), stone was widely used to make stone tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years and ended b ...
humans first took
flint
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start ...
to tip the
spear
A spear is a polearm consisting of a shaft, usually of wood, with a pointed head. The head may be simply the sharpened end of the shaft itself, as is the case with Fire hardening, fire hardened spears, or it may be made of a more durable materia ...
, it was the first example of
applying technology to improve the weapon. Since then, the advances made by human societies, and that of weapons, has been closely linked. Stone weapons gave way to
Bronze Age
The Bronze Age () was a historical period characterised principally by the use of bronze tools and the development of complex urban societies, as well as the adoption of writing in some areas. The Bronze Age is the middle principal period of ...
and Iron Age weapons such as swords and shields. With each technological change was realized some tangible increase in military capability, such as through greater effectiveness of a sharper edge in defeating armour, or Mechanics of materials, improved density of materials used in manufacture of weapons.
On Land warfare, land, the first significant technological advance in warfare was the development of ranged weapons, notably the Sling (weapon), sling and later the bow and arrow. The next significant advance came with the domestication of the horses and mastering of equestrianism, creating cavalry and allowing for faster military advances and better logistics. Possibly the most significant advancement was the wheel, a staple of transportation, starting with the chariot and eventually siege engines. The bow was manufactured in increasingly larger and more powerful versions to increase both the weapon range and armour penetration performance, developing into composite bows, recurve bows, longbows, and crossbows. These proved particularly useful during the rise of cavalry, as horsemen encased in ever-more sophisticated armour came to dominate the battlefield.
In History of China#Imperial China, medieval China, gunpowder had been invented, and was increasingly used by the military in combat. The use of gunpowder in the early mortar (weapon), vase-like mortars in Europe, and advanced versions of the longbow and crossbow with armour-piercing arrowheads, put an end to the dominance of the armoured knight. Gunpowder resulted in the development and fielding of the musket, which could be used effectively with little training. In time, the successors to muskets and cannons, in the form of rifles and
artillery
Artillery consists of ranged weapons that launch Ammunition, munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, and l ...
, would become core battlefield technology.

As the speed of technological advances accelerated in civilian applications, so too did military and warfare become Industrial warfare, industrialized. The newly invented machine gun and repeating rifle redefined firepower on the battlefield, and, in part, explains the high casualty rates of the American Civil War and the decline of melee combat in warfare. The next breakthrough was the conversion of artillery parks from the Muzzleloader, muzzle-loading guns, to quicker Breechloader, breech-loading guns with recoiling barrels that allowed quicker aimed fire and use of a shield. The widespread introduction of low smoke (smokeless) propellant powders since the 1880s also allowed for a great improvement of artillery ranges. The development of breech loading had the greatest effect on naval warfare for the first time since the Middle Ages, altering the way weapons are mounted on warships. Naval tactics were divorced from the reliance on Age of Sail, sails with the invention of the Internal combustion engine, internal combustion. A further advance in military naval technology was the submarine and the torpedo.

During
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
, the need to break the deadlock of trench warfare saw the rapid development of many new technologies, particularly tanks. Military aviation was extensively used, and bombers became decisive in many battles of World War II, which marked the most frantic period of weapons development in history. Many new designs, and concepts were used in combat, and all existing technologies of warfare were improved between 1939 and 1945.
During World War II, significant advances were made in
military communications
Military communications or military signals involve all aspects of communications, or conveyance of information, by armed forces. Examples from '' Jane's Military Communications'' include text, audio, facsimile, tactical ground-based communica ...
through increased use of radio, military intelligence through use of the radar, and in military medicine through use of penicillin, while in the air, the guided missile, jet aircraft, and helicopters were seen for the first time. Perhaps the most infamous of all military technologies was the creation of nuclear weapons, although the exact effects of its radiation were unknown until the early 1950s. Far greater use of military vehicles had finally eliminated the cavalry from the military force structure.
After World War II, with the onset of the Cold War, the constant technological development of new weapons was institutionalized, as participants engaged in a constant arms race in capability development. This constant state of weapons development continues into the present. Main battle tanks, and other heavy equipment such as armoured fighting vehicles, military aircraft, and ships, are characteristic to organized military forces.

The most significant technological developments that influenced combat have been guided missiles, which can be used by all branches of the armed services. More recently, information technology, and its use in surveillance, including space-based reconnaissance systems, have played an increasing role in military operations. The impact of information warfare, which focuses on attacking command communication systems, and military databases, has been coupled with the use of robotic systems in combat, such as unmanned combat aerial vehicles and unmanned ground vehicles.
Recently, there has also been a particular focus towards the use of renewable fuels for running military vehicles on. Unlike fossil fuels, renewable fuels can be produced in any country, creating a strategic advantage. The U.S. military has committed itself to have 50% of its energy consumption come from alternative sources.
As part of society

For much of
military history
Military history is the study of War, armed conflict in the Human history, history of humanity, and its impact on the societies, cultures and economies thereof, as well as the resulting changes to Politics, local and international relationship ...
, the armed forces were considered to be for use by the heads of their societies, until recently, the Monarchy, crowned heads of states. In a democracy or other political system run in the public interest, it is a public force.
The relationship between the military and the society it serves is a complicated and ever-evolving one. Much depends on the nature of the society itself, and whether it sees the military as important, as for example in time of threat or war, or a burdensome expense typified by defence cuts in time of peace.
One difficult matter in the relation between military and society is control and transparency. In some countries, limited information on military operations and budgeting is accessible for the public. However, transparency in the military sector is crucial to fight corruption. This showed the Government Defence Anti-corruption Index Transparency International, Transparency International UK published in 2013.
Militaries often function as society, societies within societies, by having their own military communities, military–industrial complex, economies, Military education and training, education, military medicine, medicine, and other aspects of a functioning civil society, civilian society. A military is not limited to nations in of itself, as many private military companies (or PMCs) can be used or hired by organizations and figures as security, escort, or other means of protection where police, agencies, or militaries are absent or not trusted.
Ideology and ethics
Militarist ideology is the society's social attitude of being best served, or being a beneficiary of a government, or guided by concepts embodied in the military ''culture, doctrine, system'', or ''leaders''.
Either because of the cultural memory, national history, or the potentiality of a military threat, the militarist argument asserts that a civilian population is dependent upon, and thereby subservient to the needs and goals of its military for continued independence. Militarism is sometimes contrasted with the concepts of comprehensive national power, soft power and hard power.
Most nations have separate military laws which regulate conduct in war and during peacetime. An early exponent was Hugo Grotius, whose ''De jure belli ac pacis, On the Law of War and Peace'' (1625) had a major impact of the humanitarian approach to warfare development. His theme was echoed by Gustavus Adolphus.
Ethics of warfare have developed since 1945, to create constraints on the military treatment of prisoners and civilians, primarily by the Geneva Conventions; but rarely apply to use of the military forces as internal security troops during times of political conflict that results in popular protests and incitement to popular uprising.
International protocols restrict the use, or have even created international bans on some types of weapons, notably weapons of mass destruction (WMD). International conventions define what constitutes a war crime, and provides for war crimes prosecution. Individual countries also have elaborate codes of military justice, an example being the United States' Uniform Code of Military Justice that can lead to court martial for military personnel found guilty of war crimes.
Military actions are sometimes argued to be justified by furthering a humanitarian cause, such as disaster relief operations to defend refugees; such actions are called military humanism.
See also
* Arms industry
* Civil defense
* Civilian control of the military
* Command and control
* Conscription
* Court-martial
* Deterrence theory
* Martial arts
* Martial law
* Mercenary
* Militaria
* Military academy
* Military advisor
* Military aid
* Military aid to the civil community (MACC)
* Military aid to the civil power (MACP)
* Military alliance
* Military dictatorship
* Military district
* Military engineering
* Military exercise
* Military fiat
* Military incompetence
* Military–industrial complex
* Military junta
* Military meteorology
* Military operations other than war
* Military police
* Military prison
* Military Revolution
* Military sociology
* Military terminology
* Militarization of police
* Militia
* Ministry of defence
* Mobilization
* Police
* Private military company
* Staff (military)
* Standing army
* Weapon
; Armed forces of the world
* List of countries by number of military and paramilitary personnel
* List of countries by level of military equipment
* List of countries by Global Militarization Index
* List of countries without armed forces
* List of militaries by country
* List of air forces
* Lists of armies
* List of navies
References
Notes
External links
Military Expenditure % of GDPhosted by Lebanese economy forum, extracted from the World Bank public data.
{{Authority control
Military,
Government institutions
International security
National security
Main topic articles