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The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the
federal government A federation (also known as a federal state) is a political entity characterized by a union of partially self-governing provinces, states, or other regions under a central federal government ( federalism). In a federation, the self-gover ...
charged with coordinating and supervising all agencies and functions of the government directly related to
national security National security, or national defence, is the security and defence of a sovereign state, including its citizens, economy, and institutions, which is regarded as a duty of government. Originally conceived as protection against military att ...
and the
United States Armed Forces The United States Armed Forces are the military forces of the United States. The armed forces consists of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. The president of the United States is ...
. The DoD is the largest employer in the world, with over 1.34 million active-duty service members (soldiers, marines, sailors, airmen, and guardians) as of June 2022. The DoD also maintains over 778,000
National Guard National Guard is the name used by a wide variety of current and historical uniformed organizations in different countries. The original National Guard was formed during the French Revolution around a cadre of defectors from the French Guards. Nat ...
and reservists, and over 747,000 civilians bringing the total to over 2.87 million employees. Headquartered at
the Pentagon The Pentagon is the headquarters building of the United States Department of Defense. It was constructed on an accelerated schedule during World War II. As a symbol of the U.S. military, the phrase ''The Pentagon'' is often used as a metony ...
in Arlington, Virginia, just outside Washington, D.C., the DoD's stated mission is to provide "the military forces needed to deter war and ensure our nation's security". The Department of Defense is headed by the
secretary of defense A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in so ...
, a cabinet-level head who reports directly to the
president of the United States The president of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the Federal government of the United States#Executive branch, executive branch of the Federal gove ...
. Beneath the Department of Defense are three subordinate military departments: the
Department of the Army The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
, the Department of the Navy, and the Department of the Air Force. In addition, four national intelligence services are subordinate to the Department of Defense: the Defense Intelligence Agency ( DIA), the National Security Agency (
NSA The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence (DNI). The NSA is responsible for global monitoring, collec ...
), the National Geospatial-Intelligence Agency ( NGA), and the National Reconnaissance Office ( NRO). Other Defense agencies include the Defense Advanced Research Projects Agency (
DARPA The Defense Advanced Research Projects Agency (DARPA) is a research and development agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military. Originally known as the A ...
), the Defense Logistics Agency ( DLA), the Missile Defense Agency ( MDA), the Defense Health Agency ( DHA), Defense Threat Reduction Agency ( DTRA), the Defense Counterintelligence and Security Agency ( DCSA), the Space Development Agency ( SDA) and the Pentagon Force Protection Agency ( PFPA), all of which are subordinate to the secretary of defense. Additionally, the Defense Contract Management Agency ( DCMA) is responsible for administering contracts for the DoD. Military operations are managed by eleven regional or functional
Unified combatant command A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defense that is composed of units from two or more service branches of the United States Armed Forces, ...
s. The Department of Defense also operates several joint services schools, including the Eisenhower School (ES) and the
National War College The National War College (NWC) of the United States is a school in the National Defense University. It is housed in Roosevelt Hall on Fort Lesley J. McNair, Washington, D.C., the third-oldest Army post still active. History The National War Col ...
(NWC).


History

Faced with rising tensions between the
Thirteen Colonies The Thirteen Colonies, also known as the Thirteen British Colonies, the Thirteen American Colonies, or later as the United Colonies, were a group of British colonies on the Atlantic coast of North America. Founded in the 17th and 18th centu ...
and the
British government ga, Rialtas a Shoilse gd, Riaghaltas a Mhòrachd , image = HM Government logo.svg , image_size = 220px , image2 = Royal Coat of Arms of the United Kingdom (HM Government).svg , image_size2 = 180px , caption = Royal Arms , date_est ...
, one of the first actions taken by the
First Continental Congress The First Continental Congress was a meeting of delegates from 12 of the 13 British colonies that became the United States. It met from September 5 to October 26, 1774, at Carpenters' Hall in Philadelphia, Pennsylvania, after the British Nav ...
in September 1774 was to recommend that the colonies begin defensive military preparations. In mid-June 1775, after the outbreak of the Revolutionary War, the
Second Continental Congress The Second Continental Congress was a late-18th-century meeting of delegates from the Thirteen Colonies that united in support of the American Revolutionary War. The Congress was creating a new country it first named "United Colonies" and in 1 ...
, recognizing the necessity of having a national army that could move about and fight beyond the boundaries of any particular colony, organized the
Continental Army The Continental Army was the army of the United Colonies (the Thirteen Colonies) in the Revolutionary-era United States. It was formed by the Second Continental Congress after the outbreak of the American Revolutionary War, and was establis ...
on 14 June 1775. This momentous event is commemorated in the U.S. annually as Flag Day. Later that year, Congress would charter the
Continental Navy The Continental Navy was the navy of the United States during the American Revolutionary War and was founded October 13, 1775. The fleet cumulatively became relatively substantial through the efforts of the Continental Navy's patron John Ad ...
on 13 October, and the
Continental Marines The Continental Marines were the amphibious infantry of the American Colonies (and later the United States) during the American Revolutionary War. The Corps was formed by the Continental Congress on November 10, 1775 and was disbanded in 17 ...
on 10 November.


The War Department and Navy Department

Upon the seating of the 1st U.S. Congress on 4 March 1789, legislation to create a military defense force stagnated as they focused on other concerns relevant to setting up the new government. President
George Washington George Washington (February 22, 1732, 1799) was an American military officer, statesman, and Founding Father who served as the first president of the United States from 1789 to 1797. Appointed by the Continental Congress as commander of ...
went to Congress to remind them of their duty to establish a military twice during this time. Finally, on the last day of the session, 29 September 1789, Congress created the
War Department War Department may refer to: * War Department (United Kingdom) * United States Department of War (1789–1947) See also * War Office, a former department of the British Government * Ministry of defence * Ministry of War * Ministry of Defence * D ...
. The War Department handled naval affairs until Congress created the Navy Department in 1798. The secretaries of each department reported directly to the president as cabinet-level advisors until 1949, when all military departments became subordinate to the Secretary of Defense.


National Military Establishment

After the end of World War II, President
Harry Truman Harry S. Truman (May 8, 1884December 26, 1972) was the 33rd president of the United States, serving from 1945 to 1953. A leader of the Democratic Party, he previously served as the 34th vice president from January to April 1945 under Franklin ...
proposed the creation of a unified department of national defense. In a special message to Congress on 19 December 1945, the president cited both wasteful military spending and inter-departmental conflicts. Deliberations in Congress went on for months focusing heavily on the role of the military in society and the threat of granting too much military power to the executive. On 26 July 1947, Truman signed the
National Security Act of 1947 The National Security Act of 1947 ( Pub.L.br>80-253 61 Stat.br>495 enacted July 26, 1947) was a law enacting major restructuring of the United States government's military and intelligence agencies following World War II. The majority of the pro ...
, which set up a unified military command known as the "National Military Establishment", as well as creating the
Central Intelligence Agency The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian foreign intelligence service of the federal government of the United States, officially tasked with gathering, processing, ...
, the
National Security Council A national security council (NSC) is usually an executive branch governmental body responsible for coordinating policy on national security issues and advising chief executives on matters related to national security. An NSC is often headed by a n ...
, National Security Resources Board,
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Si ...
(formerly the
Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...
) and the
Joint Chiefs of Staff The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the ...
. The act placed the National Military Establishment under the control of a single
secretary of defense A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in so ...
. The National Military Establishment formally began operations on 18 September, the day after the
Senate A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
confirmed James V. Forrestal as the first secretary of defense. The National Military Establishment was renamed the "Department of Defense" on 10 August 1949 and absorbed the three cabinet-level military departments, in an amendment to the original 1947 law. The renaming is alleged to be due to the Establishment's abbreviation, NME, being pronounced "enemy". Under the Department of Defense Reorganization Act of 1958 (), channels of authority within the department were streamlined while still maintaining the ordinary authority of the Military Departments to organize, train, and equip their associated forces. The Act clarified the overall decision-making authority of the secretary of defense with respect to these subordinate Military Departments and more clearly defined the operational
chain of command A command hierarchy is a group of people who carry out orders based on others' authority within the group. It can be viewed as part of a power structure, in which it is usually seen as the most vulnerable and also the most powerful part. Milit ...
over U.S. military forces (created by the military departments) as running from the president to the secretary of defense and then to the unified combatant commanders. Also provided in this legislation was a centralized research authority, the Advanced Research Projects Agency, eventually known as
DARPA The Defense Advanced Research Projects Agency (DARPA) is a research and development agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military. Originally known as the A ...
. The act was written and promoted by the Eisenhower administration and was signed into law 6 August 1958.


Financial discrepancies

A day before the
September 11 attacks The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by al-Qaeda against the United States on Tuesday, September 11, 2001. That morning, nineteen terrorists hijacked four commer ...
of 2001, Secretary of Defense
Donald Rumsfeld Donald Henry Rumsfeld (July 9, 1932 – June 29, 2021) was an American politician, government official and businessman who served as Secretary of Defense from 1975 to 1977 under president Gerald Ford, and again from 2001 to 2006 under Preside ...
announced that the department was unable to account for about $2.3 trillion worth of transactions.
Reuters Reuters ( ) is a news agency owned by Thomson Reuters Corporation. It employs around 2,500 journalists and 600 photojournalists in about 200 locations worldwide. Reuters is one of the largest news agencies in the world. The agency was est ...
reported in 2013 that the Pentagon was the only federal agency that had not released annual audits as required by a 1992 law. According to Reuters, the Pentagon "annually reports to Congress that its books are in such disarray that an audit is impossible". In June 2016, the Office of the Inspector General released a report stating that the Army made $6.5 trillion in wrongful adjustments to its accounting entries in 2015.


Organizational structure

The
secretary of defense A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in so ...
, appointed by the president with the advice and consent of the
Senate A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
, is by federal law () the head of the Department of Defense, "the principal assistant to the President in all matters relating to Department of Defense", and has "authority, direction, and control over the Department of Defense". Because the
Constitution A constitution is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity and commonly determine how that entity is to be governed. When these pr ...
vests all military authority in
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
and the president, the statutory authority of the secretary of defense is derived from their constitutional authority. Since it is impractical for either Congress or the president to participate in every piece of Department of Defense affairs, the secretary of defense and the secretary's subordinate officials generally exercise military authority. The Department of Defense is composed of the Office of the Secretary of Defense ( OSD), the Joint Chiefs of Staff ( JCS) and the Joint Staff ( JS), Office of the Inspector General ( DODIG), the
Combatant Commands A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defense that is composed of units from two or more service branches of the United States Armed Forces, an ...
, the Military Departments (
Department of the Army The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
(DA), Department of the Navy (DON) & Department of the Air Force (DAF)), the Defense Agencies and Department of Defense Field Activities, the
National Guard Bureau The National Guard Bureau is the federal instrument responsible for the administration of the National Guard established by the United States Congress as a joint bureau of the Department of the Army and the Department of the Air Force. It was c ...
(NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the secretary of defense. Department of Defense Directive 5100.01 describes the organizational relationships within the department, and is the foundational issuance for delineating the major functions of the department. The latest version, signed by former secretary of defense
Robert Gates Robert Michael Gates (born September 25, 1943) is an American intelligence analyst and university president who served as the 22nd United States secretary of defense from 2006 to 2011. He was originally appointed by president George W. Bush a ...
in December 2010, is the first major re-write since 1987.


Office of the Secretary of Defense

The Office of the Secretary of Defense (OSD) is the secretary and his/her deputy's (mainly) civilian staff. OSD is the principal staff element of the secretary of defense in the exercise of policy development, planning, resource management, fiscal and program evaluation and oversight, and interface and exchange with other U.S. government departments and agencies, foreign governments, and international organizations, through formal and informal processes. OSD also performs oversight and management of the Defense Agencies, Department of Defense Field Activities, and specialized Cross Functional Teams.


Defense agencies

OSD also supervises the following Defense Agencies:


National intelligence agencies

Several defense agencies are members of the
United States Intelligence Community United may refer to: Places * United, Pennsylvania, an unincorporated community * United, West Virginia, an unincorporated community Arts and entertainment Films * ''United'' (2003 film), a Norwegian film * ''United'' (2011 film), a BBC Two f ...
. These are national-level intelligence services that operate under the Department of Defense jurisdiction but simultaneously fall under the authorities of the
director of national intelligence The director of national intelligence (DNI) is a senior, cabinet-level United States government official, required by the Intelligence Reform and Terrorism Prevention Act of 2004 to serve as executive head of the United States Intelligence Co ...
. They fulfill the requirements of national policymakers and war planners, serve as Combat Support Agencies, and also assist non-Department of Defense intelligence or law enforcement services such as the
Central Intelligence Agency The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian foreign intelligence service of the federal government of the United States, officially tasked with gathering, processing, ...
and the
Federal Bureau of Investigation The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice ...
. The military services each have their own intelligence elements that are distinct from but subject to coordination by national intelligence agencies under the Department of Defense. Department of Defense manages the nation's coordinating authorities and assets in disciplines of
signals intelligence Signals intelligence (SIGINT) is intelligence-gathering by interception of '' signals'', whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication ...
,
geospatial intelligence In the United States, geospatial intelligence (GEOINT) is intelligence about the human activity on earth derived from the exploitation and analysis of imagery, signals, or signatures with geospatial information. GEOINT describes, assesses, and v ...
, and measurement and signature intelligence, and also builds, launches, and operates the Intelligence Community's satellite assets. Department of Defense also has its own human intelligence service, which contributes to the CIA's human intelligence efforts while also focusing on military human intelligence priorities. These agencies are directly overseen by the
Undersecretary of Defense for Intelligence The under secretary of defense for intelligence and security or USD(I&S) is a high-ranking civilian position in the Office of the Secretary of Defense (OSD) within the U.S. Department of Defense (DoD) that acts as the principal civilian advisor ...
. File:US Defense Intelligence Agency (DIA) seal (vector).svg,
Defense Intelligence Agency The Defense Intelligence Agency (DIA) is an intelligence agency and combat support agency of the United States Department of Defense, specializing in defense and military intelligence. A component of the Department of Defense (DoD) and the ...
File:National Security Agency.svg,
National Security Agency The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence (DNI). The NSA is responsible for global monitoring, collecti ...
File:US-NationalGeospatialIntelligenceAgency-2008Seal.svg,
National Geospatial-Intelligence Agency The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the United States Department of Defense whose primary mission is collecting, analyzing, and distributing geospatial intelligence (GEOINT) in support of natio ...
File:US-NationalReconnaissanceOffice-Seal.svg,
National Reconnaissance Office The National Reconnaissance Office (NRO) is a member of the United States Intelligence Community and an agency of the United States Department of Defense which designs, builds, launches, and operates the reconnaissance satellites of the U.S. fe ...


Joint Chiefs of Staff

The
Joint Chiefs of Staff The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the ...
(JCS) is a body of senior uniformed leaders in the Department of Defense who advise the secretary of defense, the Homeland Security Council, the
National Security Council A national security council (NSC) is usually an executive branch governmental body responsible for coordinating policy on national security issues and advising chief executives on matters related to national security. An NSC is often headed by a n ...
and the president on military matters. The composition of the Joint Chiefs of Staff is defined by statute and consists of the
chairman of the Joint Chiefs of Staff The chairman of the Joint Chiefs of Staff (CJCS) is the presiding officer of the United States Joint Chiefs of Staff (JCS). The chairman is the highest-ranking and most senior military officer in the United States Armed Forces Chairman: app ...
(CJCS),
vice chairman of the Joint Chiefs of Staff The vice chairman of the Joint Chiefs of Staff (VJCS) is, by U.S. law, the second highest-ranking military officer in the United States Armed Forces, - Vice Chairman ranking just below the chairman of the Joint Chiefs of Staff. The vice chairman ...
(VCJCS), senior enlisted advisor to the chairman (SEAC), the Military Service chiefs from the
Army An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
, Marine Corps,
Navy A navy, naval force, 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 operations and related functions. It in ...
,
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 ...
, and
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. ...
, in addition to the chief of
National Guard Bureau The National Guard Bureau is the federal instrument responsible for the administration of the National Guard established by the United States Congress as a joint bureau of the Department of the Army and the Department of the Air Force. It was c ...
, all appointed by the president following
Senate A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
confirmation. Each of the individual Military Service Chiefs, outside their Joint Chiefs of Staff obligations, works directly for the secretary of the Military Department concerned: the
secretary of the Army The secretary of the Army (SA or SECARMY) is a senior civilian official within the United States Department of Defense, with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, insta ...
,
secretary of the Navy The secretary of the Navy (or SECNAV) is a statutory officer () and the head (chief executive officer) of the Department of the Navy, a military department (component organization) within the United States Department of Defense. By law, the se ...
and secretary of the Air Force. Following the
Goldwater–Nichols Act The Goldwater–Nichols Department of Defense Reorganization Act of October 4, 1986 , (signed by President Ronald Reagan), made the most sweeping changes to the United States Department of Defense since the department was established in the ...
in 1986 the Joint Chiefs of Staff do not have operational command authority, neither individually nor collectively, as the chain of command goes from the president to the secretary of defense, and from the Secretary of Defense to the commanders of the Combatant Commands. Goldwater–Nichols also created the office of vice-chairman, and the chairman is now designated as the ''principal military adviser'' to the secretary of defense, the Homeland Security Council, the National Security Council and to the president. The Joint Staff (JS) is a headquarters staff at the
Pentagon In geometry, a pentagon (from the Greek πέντε ''pente'' meaning ''five'' and γωνία ''gonia'' meaning ''angle'') is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°. A pentagon may be sim ...
made up of personnel from all four services that assist the chairman and vice chairman in discharging their duties, and managed by the
director of the Joint Staff The director of the Joint Staff (DJS) is a three-star officer who assists the Joint Chiefs of Staff, a cabinet of senior military officers within the United States Armed Forces who advise the secretary of defense and the president on military ...
(DJS) who is a
lieutenant general Lieutenant general (Lt Gen, LTG and similar) is a three-star military rank (NATO code OF-8) used in many countries. The rank traces its origins to the Middle Ages, where the title of lieutenant general was held by the second-in-command on th ...
or vice admiral.


Military Departments and Services

There are three Military Departments within the Department of Defense: # the
Department of the Army The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
, within which the
United States Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, ...
is organized. # the Department of the Navy, within which the
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
and the
United States Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through c ...
are organized. # the Department of the Air Force, within which the
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Si ...
and
United States Space Force The United States Space Force (USSF) is the space service branch of the U.S. Armed Forces, one of the eight U.S. uniformed services, and the world's only independent space force. Along with its sister branch, the U.S. Air Force, the Space ...
are organized. The Military Departments are each headed by their own secretary (i.e.,
Secretary of the Army The secretary of the Army (SA or SECARMY) is a senior civilian official within the United States Department of Defense, with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, insta ...
,
Secretary of the Navy The secretary of the Navy (or SECNAV) is a statutory officer () and the head (chief executive officer) of the Department of the Navy, a military department (component organization) within the United States Department of Defense. By law, the se ...
and Secretary of the Air Force), appointed by the president, with the advice and consent of the
Senate A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
. They have the legal authority under
Title 10 of the United States Code Title 10 of the United States Code outlines the role of armed forces in the United States Code. It provides the legal basis for the roles, missions and organization of each of the services as well as the United States Department of Defense. Ea ...
to conduct all the affairs of their respective departments within which the military services are organized. The secretaries of the Military Departments are (by law) subordinate to the
secretary of defense A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in so ...
and (by SecDef delegation) to the
deputy secretary of defense The deputy secretary of defense (acronym: DepSecDef) is a statutory office () and the second-highest-ranking official in the Department of Defense of the United States of America. The deputy secretary is the principal civilian deputy to the sec ...
. Secretaries of Military Departments, in turn, normally exercise authority over their forces by delegation through their respective service chiefs (i.e., Chief of Staff of the Army,
Commandant of the Marine Corps The commandant of the Marine Corps (CMC) is normally the highest-ranking officer in the United States Marine Corps and is a member of the Joint Chiefs of Staff. Joint Chiefs of Staff: composition; functions. The CMC reports directly to the secr ...
,
Chief of Naval Operations The chief of naval operations (CNO) is the professional head of the United States Navy. The position is a statutory office () held by an admiral who is a military adviser and deputy to the secretary of the Navy. In a separate capacity as a memb ...
, Chief of Staff of the Air Force, and
Chief of Space Operations The chief of space operations (CSO) is the service chief of the United States Space Force. The CSO is the principal military adviser to the secretary of the Air Force for Space Force operations and, as a member of the Joint Chiefs of Staff, a m ...
) over forces not assigned to a Combatant Command. Secretaries of Military Departments and service chiefs do not possess operational command authority over U.S. troops (this power was stripped from them in the Defense Reorganization Act of 1958), and instead, Military Departments are tasked solely with "the training, provision of equipment, and administration of troops." File:United States Department of the Army Seal.svg,
Department of the Army The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
File:United States Department of the Navy Seal.svg, Department of the Navy File:Seal of the US Air Force.svg, Department of the Air Force
File:Mark of the United States Army.svg,
U.S. Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
File:Emblem of the United States Marine Corps.svg,
U.S. Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through co ...
File:Emblem of the United States Navy.svg,
U.S. Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage o ...
File:Mark of the United States Air Force.svg, U.S. Air Force File:Seal of the United States Space Force.svg,
U.S. Space Force The United States Space Force (USSF) is the space service branch of the U.S. Armed Forces, one of the eight U.S. uniformed services, and the world's only independent space force. Along with its sister branch, the U.S. Air Force, the Space ...


Unified Combatant Commands

A
unified combatant command A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defense that is composed of units from two or more service branches of the United States Armed Forces, ...
is a military command composed of personnel/equipment from at least two Military Departments, which has a broad/continuing mission. These Military Departments are responsible for equipping and training troops to fight, while the Unified Combatant Commands are responsible for military forces' actual operational command. Almost all operational U.S. forces are under the authority of a Unified Command. The Unified Commands are governed by a Unified Command Plan—a frequently updated document (produced by the DoD), which lays out the Command's mission, geographical/functional responsibilities, and force structure. During military operations, the chain of command runs from the president to the
secretary of defense A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in so ...
to the combatant commanders of the Combatant Commands. the United States has eleven Combatant Commands, organized either on a geographical basis (known as "
area of responsibility Area of responsibility (AOR) is a pre-defined geographic region assigned to Combatant commanders of the Unified Command Plan (UCP), that are used to define an area with specific geographic boundaries where they have the authority to plan and co ...
", AOR) or on a global, functional basis: * U.S. Northern Command (USNORTHCOM) *
U.S. Southern Command The United States Southern Command (USSOUTHCOM), located in Doral, Florida in Greater Miami, is one of the eleven unified combatant commands in the United States Department of Defense. It is responsible for providing contingency planning, o ...
(USSOUTHCOM) *
U.S. Central Command The United States Central Command (USCENTCOM or CENTCOM) is one of the eleven unified combatant commands of the U.S. Department of Defense. It was established in 1983, taking over the previous responsibilities of the Rapid Deployment Joint Tas ...
(USCENTCOM) * U.S. European Command (USEUCOM) * U.S. Indo-Pacific Command (USINDOPACOM) * U.S. Africa Command (USAFRICOM) * U.S. Strategic Command (USSTRATCOM) * U.S. Special Operations Command (USSOCOM) *
U.S. Transportation Command The United States Transportation Command (USTRANSCOM) is one of eleven unified combatant commands of the United States Department of Defense. The command is located at Scott Air Force Base, Illinois, and was established in 1987. The USTRANSCO ...
(USTRANSCOM) * U.S. Cyber Command (USCYBERCOM) * U.S. Space Command (USSPACECOM)


Budget

Department of Defense spending in 2017 was 3.15% of GDP and accounted for about 38% of budgeted global military spending – more than the next 7 largest militaries combined. By 2019, the 27th secretary of defense had begun a line-by-line review of the defense budget; in 2020 the secretary identified items amounting to $5.7 billion, out of a $106 billion subtotal (the so-called "fourth estate" agencies such as missile defense, and defense intelligence, amounting to 16% of the defense budget),Mackenzie Eaglen (05 February 2020) Is Army Richest Service? Navy? Air Force? AEI’s Eaglen Peels Back Budget Onion
/ref> He will re-deploy to the modernization of hypersonics, artificial intelligence, and missile defense.Paul McLeary (February 05, 2020) SecDef Eyeing Moving Billions By Eliminating Offices, Legacy Systems
/ref> Beyond 2021 the 27th secretary of defense is projecting the need for yearly budget increases of 3 to 5 percent to modernize.McLeary (February 06, 2020) Flatline: SecDef Esper Says DoD Budgets Must Grow 3-5%
/ref> The Department of Defense accounts for the majority of federal discretionary spending. In FY 2017, the Department of Defense budgeted spending accounted for 15% of the U.S. federal budget, and 49% of federal discretionary spending, which represents funds not accounted for by pre-existing obligations. However, this does not include many military-related items that are outside the Defense Department budget, such as nuclear weapons research, maintenance, cleanup, and production, which is in the Department of Energy budget, Veterans Affairs, the Treasury Department's payments in pensions to military retirees and widows and their families, interest on debt incurred in past wars, or State Department financing of foreign arms sales and militarily-related development assistance. Neither does it include defense spending that is not military in nature, such as the Department of Homeland Security, counter-terrorism spending by the FBI, and intelligence-gathering spending by the NSA. In the
2010 United States federal budget The United States Federal Budget for Fiscal Year 2010, titled A New Era of Responsibility: Renewing America's Promise, is a spending request by President Barack Obama to fund government operations for October 2009–September 2010. Figure ...
, the Department of Defense was allocated a base budget of $533.7 billion, with a further $75.5 billion adjustment in respect of 2009, and $130 billion for overseas contingencies. The subsequent 2010 Department of Defense Financial Report shows the total budgetary resources for
fiscal year A fiscal year (or financial year, or sometimes budget year) is used in government accounting, which varies between countries, and for budget purposes. It is also used for financial reporting by businesses and other organizations. Laws in many ...
2010 were $1.2 trillion. Of these resources, $1.1 trillion were obligated and $994 billion were disbursed, with the remaining resources relating to multi-year modernization projects requiring additional time to procure. After over a decade of non-compliance,
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
has established a deadline of
Fiscal year A fiscal year (or financial year, or sometimes budget year) is used in government accounting, which varies between countries, and for budget purposes. It is also used for financial reporting by businesses and other organizations. Laws in many ...
2017 for the Department of Defense to achieve audit readiness. In 2015 the allocation for the Department of Defense was $585 billion, the highest level of budgetary resources among all Federal agencies, and this amounts to more than one-half of the annual Federal Expenditures in the United States federal budget discretionary budget. On 9/28/2018, President Donald Trump signed the Department of Defense and Labor, Health and Human Services, and Education Appropriations Act, 2019 and Continuing Appropriations Act, 2019 (H.R.6157) into law. On 30 September 2018, the FY2018 Budget expired and the FY2019 budget came into effect.


For FY2019

The FY2019 Budget for the Department of Defense is approximately $686,074,048,000 (Including Base + Overseas Contingency Operations + Emergency Funds) in discretionary spending and $8,992,000,000 in mandatory spending totaling $695,066,000,000 Undersecretary of Defense (Comptroller) David L. Norquist said in a hearing regarding the FY 2019 budget: "The overall number you often hear is $716 billion. That is the amount of funding for national defense, the accounting code is 050, and includes more than simply the Department of Defense. It includes, for example, the Department of Energy and others. That large a number, if you back out the $30 billion for non-defense agencies, you get to $686 billion. That is the funding for the Department of Defense, split between $617 billion in base and $69 billion in overseas contingency." The Department of Defense budget encompasses the majority of the National Defense Budget of approximately $716.0 billion in discretionary spending and $10.8 billion in mandatory spending for a $726.8 billion total. Of the total, $708.1 billion falls under the jurisdiction of the House Committee on Armed Services and Senate Armed Services Committee and is subject to authorization by the annual
National Defense Authorization Act The National Defense Authorization Act (NDAA) is the name for each of a series of United States federal laws specifying the annual budget and expenditures of the U.S. Department of Defense. The first NDAA was passed in 1961. The U.S. Congress o ...
(NDAA). The remaining $7.9 billion falls under the jurisdiction of other congressional committees. The Department of Defense is unique because it is one of the few federal entities where the majority of its funding falls into the discretionary category. The majority of the entire federal budget is mandatory, and much of the discretionary funding in the budget consists of DoD dollars.


Budget overview

* Numbers may not add due to rounding


Energy use

The Department of Defense was the largest single consumer of energy in the United States in 2006. It is one of the largest carbon polluters in history, producing more carbon emissions than the total emissions of over 100 countries combined. In FY 2006, the department used almost 30,000 gigawatt hours (GWH) of electricity, at the cost of almost $2.2 billion. The department's electricity use would supply enough electricity to power more than 2.6 million average American homes. In electricity consumption, if it were a country, the department would rank 58th in the world, using slightly less than
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and slightly more than
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
(CIA World Factbook, 2006).Colonel Gregory J. Lengyel, USAF, The Brookings Institution, Department of Defense Energy Strategy, August 2007. The Department of Defense was responsible for 93% of all US government fuel consumption in 2007 ( Department of the Air Force: 52%; Department of the Navy: 33%;
Department of the Army The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
: 7%; other Department components: 1%). The Department of Defense uses of fuel annually, an average of of fuel per day. A large Army division may use about per day. According to the 2005 ''
CIA World Factbook ''The World Factbook'', also known as the ''CIA World Factbook'', is a reference resource produced by the Central Intelligence Agency (CIA) with almanac-style information about the countries of the world. The official print version is available ...
'', if it were a country, the Department of Defense would rank 34th in the world in average daily oil use, coming in just behind
Iraq Iraq,; ku, عێراق, translit=Êraq officially the Republic of Iraq, '; ku, کۆماری عێراق, translit=Komarî Êraq is a country in Western Asia. It is bordered by Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq ...
and just ahead of
Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic countries, Nordic c ...
. The Air Force is the largest user of fuel energy in the
federal government A federation (also known as a federal state) is a political entity characterized by a union of partially self-governing provinces, states, or other regions under a central federal government ( federalism). In a federation, the self-gover ...
. The Air Force uses 10% of the nation's aviation fuel. (
JP-8 JP-8, or JP8 (for "Jet Propellant 8") is a jet fuel, specified and used widely by the US military. It is specified by MIL-DTL-83133 and British Defence Standard 91-87, and similar to commercial aviation's Jet A-1, but with the addition of corrosi ...
accounts for nearly 90% of its fuels.) This fuel usage breaks down as such: 82% jet fuel, 16% facility management and 2% ground vehicle/equipment.


Criticism

In the latest Center for Effective Government analysis of 15 federal agencies which receive the most
Freedom of Information Act Freedom of Information Act may refer to the following legislations in different jurisdictions which mandate the national government to disclose certain data to the general public upon request: * Freedom of Information Act 1982, the Australian act * ...
requests, published in 2015 (using 2012 and 2013 data, the most recent years available), the DoD earned 61 out of a possible 100 points, a D− grade. While it had improved from a failing grade in 2013, it still had low scores in processing requests (55%) and their disclosure rules (42%). A 2013 ''Reuters'' investigation concluded that Defense Finance & Accounting Service, the Department of Defense’s primary financial management arm, implements monthly “unsubstantiated change actions”—illegal, inaccurate “plugs”—that forcibly make DOD’s books match Treasury’s books. It concluded:
Fudging the accounts with false entries is standard operating procedure… Reuters has found that the Pentagon is largely incapable of keeping track of its vast stores of weapons, ammunition, and other supplies; thus it continues to spend money on new supplies it doesn’t need and on storing others long out of date. It has amassed a backlog of more than half a trillion dollars… w much of that money paid for actual goods and services delivered isn’t known.
In 2015, a Pentagon consulting firm performed an audit on the Department of Defense's budget. It found that there was $125 billion in wasteful spending that could be saved over the next five years without layoffs or reduction in military personnel. In 2016, ''
The Washington Post ''The Washington Post'' (also known as the ''Post'' and, informally, ''WaPo'') is an American daily newspaper published in Washington, D.C. It is the most widely circulated newspaper within the Washington metropolitan area and has a large n ...
'' uncovered that rather than taking the advice of the auditing firm, senior defense officials suppressed and hid the report from the public to avoid political scrutiny. Shortly after the 2020 Baghdad International Airport airstrike, the
Iranian parliament The Islamic Consultative Assembly ( fa, مجلس شورای اسلامی, Majles-e Showrā-ye Eslāmī), also called the Iranian Parliament, the Iranian Majles (Arabicised spelling Majlis) or ICA, is the national legislative body of Iran. The Pa ...
designated all of the U.S. military, including the Department of Defense, as a
terrorist organization A number of national governments and two international organizations have created lists of organizations that they designate as terrorist. The following list of designated terrorist groups lists groups designated as terrorist by current and fo ...
.


Related legislation

The organization and functions of the Department of Defense are in
Title 10 of the United States Code Title 10 of the United States Code outlines the role of armed forces in the United States Code. It provides the legal basis for the roles, missions and organization of each of the services as well as the United States Department of Defense. Ea ...
. Other significant legislation related to the Department of Defense includes: * 1947:
National Security Act of 1947 The National Security Act of 1947 ( Pub.L.br>80-253 61 Stat.br>495 enacted July 26, 1947) was a law enacting major restructuring of the United States government's military and intelligence agencies following World War II. The majority of the pro ...
* 1958: Department of Defense Reorganization Act, * 1963: Department of Defense Appropriations Act, * 1963: Military Construction Authorization Act, * 1967: Supplemental Defense Appropriations Act, * 1984: Department of Defense Authorization Act, * 1986: Goldwater-Nichols Act of 1986 (Department of Defense Reorganization Act), * 1996: Antiterrorism and Effective Death Penalty Act,


See also

*
Arms industry The arms industry, also known as the arms trade, is a global industry classification, industry which manufacturing, manufactures and sells weapons and military technology. It consists of a commerce, commercial Private industry, industry involved ...
* List of United States military bases *
Military–industrial complex The expression military–industrial complex (MIC) describes the relationship between a country's military and the defense industry that supplies it, seen together as a vested interest which influences public policy. A driving factor behind the ...
*
Nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bomb ...
s *
Private military company A private military company (PMC) or private military and security company (PMSC) is a private company providing armed combat or security services for financial gain. PMCs refer to their personnel as "security contractors" or "private military ...
* Title 32 of the Code of Federal Regulations *
United States Department of Homeland Security The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-ter ...
*
United States Department of Justice The United States Department of Justice (DOJ), also known as the Justice Department, is a federal executive department of the United States government tasked with the enforcement of federal law and administration of justice in the United Stat ...
*
United States Department of Veterans Affairs The United States Department of Veterans Affairs (VA) is a Cabinet-level executive branch department of the federal government charged with providing life-long healthcare services to eligible military veterans at the 170 VA medical centers a ...
* Warrior Games * JADE (planning system) * Global Command and Control System


References


External links

*
Department of Defense
on USAspending.gov
Department of Defense
in the
Federal Register The ''Federal Register'' (FR or sometimes Fed. Reg.) is the official journal of the federal government of the United States that contains government agency rules, proposed rules, and public notices. It is published every weekday, except on fede ...

Office of the Under Secretary of Defense (Comptroller)
Budget and Financial Management Policy
Death and Taxes: 2009
��A visual guide and infographic of the 2009 United States federal budget, including the Department of Defense with data provided by the Comptrollers office.

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Defense Defense or defence may refer to: Tactical, martial, and political acts or groups * Defense (military), forces primarily intended for warfare * Civil defense, the organizing of civilians to deal with emergencies or enemy attacks * Defense indus ...