The Defence Forces (, officially styled )
[ derives its origins from the Irish Volunteers. Whilst the Irish for ''Defence Forces'' is , as Ó Cearúil (1999) points out, the Defence Forces are officially styled . is used in other contexts (e.g. is ''Defence Force Regulations'') as well as having a defined meaning in legislation.] are the
armed forces
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 ...
of
Ireland
Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...
. They encompass the
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 ...
,
Air Corps,
Naval Service, and
Reserve Defence Forces.
The Supreme Commander of the Defence Forces is the
President of Ireland
The president of Ireland () is the head of state of Republic of Ireland, Ireland and the supreme commander of the Defence Forces (Ireland), Irish Defence Forces. The presidency is a predominantly figurehead, ceremonial institution, serving as ...
. All Defence Forces officers hold their
commission
In-Commission or commissioning may refer to:
Business and contracting
* Commission (remuneration), a form of payment to an agent for services rendered
** Commission (art), the purchase or the creation of a piece of art most often on behalf of anot ...
from the President, but in practice, the
Minister for Defence acts on the President's behalf and reports to the
Government of Ireland
The Government of Ireland () is the executive (government), executive authority of Republic of Ireland, Ireland, headed by the , the head of government. The government – also known as the cabinet (government), cabinet – is composed of Mini ...
. The Minister for Defence is advised by the Council of Defence on the business of the
Department of Defence.
As of December 2023, there were 7,550 permanent personnel in the Defence Forces out of an established strength of 9,500,
a decrease from September 2020 when there were 8,529 personnel, comprising 6,878 Army, 752 Air Corps and 899 Naval Service personnel. As of August 2024, there were also 1,720 personnel in the Reserve Defence Force out of an established strength of 4,069.
Role
The Irish state has
a long-standing policy of
non-belligerence
A non-belligerent is a person, a sovereign state, state, or other organization that does not fight in a given conflict. The term is often used to describe a country that does not take part militarily in a war.
A non-belligerent state differs from ...
in armed conflicts, including
neutrality in World War II. Ireland's military capabilities are modest. However, the state has a long history of involvement in
United Nations peacekeeping
Peacekeeping by the United Nations is a role of the United Nations's Department of Peace Operations and an "instrument developed by the organization as a way to help countries torn by conflict to create the conditions for lasting peace". It is ...
operations. Functions of the Defence Forces include:
*Preparation for the defence of the state against armed attack.
*Assisting the police force, the
Garda SÃochána
(; meaning "the Guardian(s) of the Peace") is the national police and security service of Republic of Ireland, Ireland. It is more commonly referred to as the Gardaà (; "Guardians") or "the Guards". The service is headed by the Garda Commissio ...
, including the protection of the internal security of the state.
*Peacekeeping, crisis management and humanitarian relief operations in support of the United Nations.
*Policing the fisheries, in accordance with the state's obligations under
European Union
The European Union (EU) is a supranational union, supranational political union, political and economic union of Member state of the European Union, member states that are Geography of the European Union, located primarily in Europe. The u ...
agreements.
*Miscellaneous civil contingency duties requested by the government such as search and rescue, air ambulance provision, providing secure air transport for ministers, assistance in the event of natural and other disasters, ensuring the maintenance of essential services, and assisting in dealing with oil pollution at sea.
History
The Defence Forces trace their origins to the
Irish Volunteers, founded in 1913. Their official
Irish-language title,
Óglaigh na hÉireann, is taken from the equivalent Irish-language title of the Irish Volunteers, as are their
cap badge
A cap badge, also known as head badge or hat badge, is a badge worn on uniform headgear and distinguishes the wearer's nationality and/or organisation. The wearing of cap badges is a convention commonly found among military and police forces, as ...
and the buttons worn on ceremonial uniforms (the buttons are still marked with the initials "IV").
The Irish Volunteers were central to the
Easter Rising
The Easter Rising (), also known as the Easter Rebellion, was an armed insurrection in Ireland during Easter Week in April 1916. The Rising was launched by Irish republicans against British rule in Ireland with the aim of establishing an ind ...
staged in April 1916. After the rising, the Volunteers gave allegiance to the
First Dáil, the parliament of the
revolutionary
A revolutionary is a person who either participates in, or advocates for, a revolution. The term ''revolutionary'' can also be used as an adjective to describe something producing a major and sudden impact on society.
Definition
The term—bot ...
Irish Republic
The Irish Republic ( or ) was a Revolutionary republic, revolutionary state that Irish Declaration of Independence, declared its independence from the United Kingdom of Great Britain and Ireland in January 1919. The Republic claimed jurisdict ...
. At this time, the Volunteers became known as the
Irish Republican Army
The Irish Republican Army (IRA) is a name used by various Resistance movement, resistance organisations in Ireland throughout the 20th and 21st centuries. Organisations by this name have been dominantly Catholic and dedicated to anti-imperiali ...
(IRA). From 1919 onwards, the IRA waged a
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 ...
campaign against
British rule in Ireland that is now known as the
War of Independence.
A
truce in July 1921 brought hostilities to an end; the
Anglo-Irish Treaty was signed on 6 December. The
Provisional Government
A provisional government, also called an interim government, an emergency government, a transitional government or provisional leadership, is a temporary government formed to manage a period of transition, often following state collapse, revoluti ...
was then constituted on 14 January 1922. The IRA was divided between those who accepted the decision of the Dáil in ratifying the Treaty and those who did not: consequently, both
civil war
A civil war is a war between organized groups within the same Sovereign state, state (or country). The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies.J ...
and re-occupation by the British became possible.
In February 1922, the pro-treaty IRA became the
National Army of the Irish Free State.
With declining relations between the remaining units of the
anti-treaty IRA and the newly recruited pro-treaty National Army, the
Irish Civil War
The Irish Civil War (; 28 June 1922 – 24 May 1923) was a conflict that followed the Irish War of Independence and accompanied the establishment of the Irish Free State, an entity independent from the United Kingdom but within the British Emp ...
broke out on 28 June 1922. It ended in victory for the National Army when, on 24 May 1923, the anti-treaty
IRA Chief of Staff,
Frank Aiken ordered his volunteers to dump arms.
On 3 August 1923 the new state passed the Defence Forces (Temporary Provisions) Act, raising "an armed force to be called Oglaigh na hEireann (hereinafter referred to as the Forces) consisting of such number of
officers,
non-commissioned officers
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 ...
, and men as may from time to time be provided by the
Oireachtas
The Oireachtas ( ; ), sometimes referred to as Oireachtas Éireann, is the Bicameralism, bicameral parliament of Republic of Ireland, Ireland. The Oireachtas consists of the president of Ireland and the two houses of the Oireachtas (): a house ...
the new parliament of the Irish Free State."
The Forces were established on 1 October 1924.
The state was officially neutral during
World War II
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 ...
but declared an
official state of emergency on 2 September 1939, and the Army was mobilised. As the Emergency progressed, more and newer equipment was purchased for the rapidly expanding force from Britain and the United States as well as some manufactured at home. For the duration of the Emergency, Ireland, while formally neutral, tacitly supported the
Allies in several ways.
[Fanning, R., 1983, Independent Ireland, Dublin: Helicon, Ltd.., pp 124–25] Allied aircraft were allowed to access the
Atlantic Ocean
The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ...
via the
Donegal Corridor. German military personnel were interned in the
Curragh along with the belligerent powers' servicemen, whereas Allied airmen and sailors who crashed in Ireland were very often repatriated, usually by secretly moving them across the border to
Northern Ireland
Northern Ireland ( ; ) is a Countries of the United Kingdom, part of the United Kingdom in the north-east of the island of Ireland. It has been #Descriptions, variously described as a country, province or region. Northern Ireland shares Repub ...
.
G2, the Army's intelligence section, played a vital role in the detection and arrest of German spies, such as
Hermann Görtz.
In September 1946, the Naval Service was established as Ireland's maritime force and as a permanent component of the Defence Forces.
Ireland became a member of the
United Nations
The United Nations (UN) is the Earth, global intergovernmental organization established by the signing of the Charter of the United Nations, UN Charter on 26 June 1945 with the stated purpose of maintaining international peace and internationa ...
in 1955. The first contribution to peacekeeping was in 1958 when Army officers were assigned to the
United Nations Observation Group in Lebanon (UNOGIL). Since 1958 the Defence Forces have had a continuous presence on armed
United Nations peacekeeping
Peacekeeping by the United Nations is a role of the United Nations's Department of Peace Operations and an "instrument developed by the organization as a way to help countries torn by conflict to create the conditions for lasting peace". It is ...
operations, except between May 1974 to May 1978 (although they did retain overseas unarmed observer missions during this period). The first armed peacekeeping mission was to the
Operation des Nations Unies au Congo (ONUC) in 1960. During the ONUC mission, a company from the Irish Army were involved in a
battle at Jadotville, in which the Irish held out against a larger Katangese force. A memorial to Irish personnel who served as United Nations peacekeepers was unveiled in 2009 in the town of
Fermoy
Fermoy () is a town on the Munster Blackwater, River Blackwater in east County Cork, Ireland. As of the 2022 census of Ireland, 2022 census, the town and environs had a population of approximately 6,700 people. It is located in the barony (Ir ...
, recording that there was a total of ninety Irish fatalities while on active service with the UN until that date.
During
the Troubles
The Troubles () were an ethno-nationalist conflict in Northern Ireland that lasted for about 30 years from the late 1960s to 1998. Also known internationally as the Northern Ireland conflict, it began in the late 1960s and is usually deemed t ...
, the period of civil conflict centred on
Northern Ireland
Northern Ireland ( ; ) is a Countries of the United Kingdom, part of the United Kingdom in the north-east of the island of Ireland. It has been #Descriptions, variously described as a country, province or region. Northern Ireland shares Repub ...
from 1969 to 1998, the Defence Forces deployed to aid the Garda SÃochána. Troops were deployed for duty to
the border areas, new border military posts were established, and in 1973 new permanent border units were established. In 1969-70, there were proposals considered for a limited military intervention in Northern Ireland to protect the nationalist community, known as
Exercise Armageddon, but it was seen to be unworkable and was not adopted by the cabinet. Although units were moved to the border region in 1969–70 during the
Battle of the Bogside, in order to provide medical support to those wounded in the fighting. In 1974, troops were deployed to maximum-security prisons in
Portlaoise
Portlaoise ( ), or Port Laoise (), is the county town of County Laois, Republic of Ireland, Ireland.
It is in the Midland Region, Ireland, South Midlands in the province of Leinster.
Portlaoise was the fastest growing of the top 20 largest town ...
and
Limerick where IRA prisoners were detained. Armed troops were deployed in 1976 to all major post offices during a three-month national bank strike. In 1978,
cash-in-transit escorts were established to protect large cash movements throughout the state, continuing until 2014. The
Central Bank of Ireland had the Government put in place contingency plans to provide armed Defence Force security for major Irish banks over public order fears if a cash shortage was triggered at the height of the 2008/2009 financial crisis. Tasks in
military aid to the civil power continue today, but no longer to the same degree or intensity.
Funding and development
In 2020, the Irish defence budget was €1.04bn. This included €780m on defence and €259m on army pensions. Department of Defence spending was 0.27% of GDP in 2020 and 0.29% in 2019.
In 2022, the defence sector budget was €1.1bn and in July of that year the Irish government announced plans to increase this to €1.5bn by 2028. As part of the plans to move to "Level of Action 2", as of 2022, the number of civil and military personnel was set to be increased from 9,500 to 11,500. Planning also began for improvements in radar capabilities. The Defence Forces specified the procurement of an integrated radar system for land, sea and air function and that the Army's structures and capabilities would be redesigned to meet "international best practice". The plan also proposed the establishment of an Office of Reserve Affairs to design a Reserve Defence Forces "regeneration plan".Â
The projected budget for 2024 was €1.5bn, including an extra €21m over previous expenditure and €34m in capital expenditure on top of the original capital ceiling of the National Development Plan. This also included budget for an additional 400 enlisted personnel during 2024.
Organisation
The Defence Forces are organised under the
Chief of Staff
The title chief of staff (or head of staff) identifies the leader of a complex organization such as the armed forces, institution, or body of persons and it also may identify a principal staff officer (PSO), who is the coordinator of the supportin ...
, supported by Deputy Chief of Staff Operations, and the Deputy Chief of Staff Support. They consist of a Permanent Defence Force (PDF), which is a
standing
Standing, also referred to as orthostasis, is a position in which the body is held in an upright (orthostatic) position and supported only by the feet. Although seemingly static, the body rocks slightly back and forth from the ankle in the ...
force and provides the main capability for military operations, and the
Reserve Defence Forces (RDF),
military reserve forces which support the PDF if necessary. The PDF is organised into three service branches: the
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 ...
, the
Naval Service, and the
Air Corps. The RDF may be further subdivided into a First Line Reserve (FLR) and a Second Line Reserve; the First Line Reserve comprises former members of the Permanent Defence Force, while the Second Line Reserve comprises an
Army Reserve and a
Naval Service Reserve (both recruited directly from the civilian population). A reorganization of the RDF in 2013, referred to as the "single force concept", has resulted in units of the RDF being embedded within units of the PDF, rather than existing entirely in parallel as a separate reserve force; this moves away from the traditional approach of the RDF being considered a fourth service branch of the Defence Forces.
In January 2022, the Commission on the Defence Forces recommended the establishment of an 'Information Command', under the command of a general, to handle cyberattacks and misinformation.
Army
As of December 2023, the Army had approximately 6,136 active personnel,
with 1,351 personnel in the
Army Reserve.
Up to late 2012 the army had three
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: 1 Southern, 2 Eastern and 4 Western; in 2012,
4 Western Brigade stood down at its HQ Custume Barracks, Athlone. The state is now divided into two Brigade areas for administrative and operational reasons, with the former 4 Western Brigade split between the other two brigades. In addition to the brigade structure, there is also the Defence Forces Training Centre, a logistics base in the
Curragh.
The two-brigade structure envisages distinct operational areas of responsibility for each of the brigades. The
1st Brigade has primary responsibility for operational tasks in the southern region, while the
2nd Brigade leads on operational tasks in the eastern and western regions. Practical operational considerations dictate the requirement to outline operational areas of responsibility. The brigade structure is based on strengthened
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 ...
and
combat-support elements, together with streamlined
combat-service-support elements.
The Army has nine specialist
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 ...
, each designated as either combat, combat support or combat service support. These are the
Infantry Corps,
Artillery Corps
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 ...
,
Cavalry Corps,
Engineer Corps,
Ordnance Corps,
Medical Corps
A medical corps is generally a military branch or staff corps, officer corps responsible for medical care for serving military personnel. Such officers are typically military physicians.
List of medical corps
The following organizations are exam ...
,
Transport Corps,
Military Police Corps, and the
Communications and Information Services Corps. In the case of corps which support the
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 ...
, a Corps Director and staff are provided to coordinate the purchase of specialised equipment, the execution of specialised training, and other necessary activities.
Irish infantry are equipped with
assault rifle
An assault rifle is a select fire rifle that uses an intermediate cartridge, intermediate-rifle cartridge and a Magazine (firearms), detachable magazine.C. Taylor, ''The Fighting Rifle: A Complete Study of the Rifle in Combat'', F.A. Moyer '' ...
s,
machine guns,
grenade launchers,
hand grenade
A grenade is a small explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a Shell (projectile), shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher. A mod ...
s, and
anti-tank weapons. Most weapons used by their defence forces follow
NATO
The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...
standards and are purchased from abroad, with Ireland having a very limited arms industry. The Army has light armoured vehicles, with the primary vehicle being the
MOWAG Piranha, armed with machine guns. Its
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 ...
capabilities consist of 120mm mortars and towed 105mm light guns.
The
Army Ranger Wing (ARW) are the
special forces
Special forces or special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, selected, trained and equip ...
of Ireland. They are based at the Curragh.
Air Corps

The Air Corps is the air component of the Defence Forces. Its HQ is at
Casement (Baldonnel) Aerodrome. The Air Corps is the smallest of the branches of the Defence Forces, with approximately 689 personnel,
and its primary roles are defined as:
#Support of the Army
#Support of the Naval Service
#
Aid to the civil power
There are two secondary roles:
#
Aid to the civil community
#Aid to government departments
The Air Corps provides support to the Army and Naval Service, together with non-military air services such as the
Emergency Aeromedical (air ambulance) Service, VIP transport, and
search and rescue
Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger. The general field of search and rescue includes many specialty sub-fields, typically determined by the type of terrain the search ...
(in support of Irish Coast Guard, Coast Guard search and rescue efforts). The Air Corps is unable to provide the traditional air force role of defending Irish airspace as it has no fighter aircraft.
The Air Corps has two EADS CASA C-295, Airbus C295 maritime patrol aircraft equipped with detection systems to assist the Naval Service in patrolling Ireland's territorial waters and exclusive economic zone. These aircraft are also used for high-altitude military parachuting, high-altitude, low-opening parachuting by the Army's ARW. The Air Corps has six AgustaWestland AW139 utility helicopters capable of being armed with FN MAG machine guns. These are used in support of the ARW, Naval Service and
Garda SÃochána
(; meaning "the Guardian(s) of the Peace") is the national police and security service of Republic of Ireland, Ireland. It is more commonly referred to as the Gardaà (; "Guardians") or "the Guards". The service is headed by the Garda Commissio ...
operations, and are the only helicopters within the state capable of flying at night in mountain terrain using night vision, night-vision technology. The eight Pilatus PC-9 turboprop trainers can be equipped with rocket pods and machine guns, and two Eurocopter EC135 light utility helicopters (which can be used as sniper platforms by the ARW) are used for training pilots and for air-ambulance missions.
The Air Corps conducted over 130 maritime surveillance patrol flights in 2019, and provided medical support to the Health Service Executive, HSE for patients by conducting over 233 Emergency Aeromedical Service missions and 32 inter-hospital air ambulance transfers.
Naval Service

The Naval Service maintains a complement of approximately 725 active personnel
and 97 reserve personnel
and is tasked with patrolling Irish territorial waters as well as the Irish Conservation Box, a large area of sea in which fishing is restricted to preserve fish numbers. It is tasked with enforcing this European Union, European-Union-protected area and thus serves the EU as well as Ireland.
Together with the
Air Corps and Office of the Revenue Commissioners, Customs, it has intercepted a number of vessels carrying narcotics to and from Ireland.
The Naval Service has six patrol vessels (2xP50, 4xP60) which are operated in support of the service's primary roles, inflatable seagoing craft, and training vessels. It maintains highly-trained armed boarding party, boarding parties that can seize a vessel if necessary. In 2019, for example, there were approximately 780 boarding operations and 12 vessels were detained .
The service's specialised diving unit is the Naval Service Diving Section.
The primary role is defined as "National Security", with secondary roles which include:
# Fishery protection
# Aid to the civil power
# Drug interdiction
# Maritime safety
# Diving operations
# Pollution control
# Overseas mission support
Reserve Defence Forces
The
Reserve Defence Forces (RDF) in its current form was established in October 2005 and comprises the First Line Reserve,
Army Reserve (AR) and
Naval Service Reserve (NSR). The RDF is a part-time, voluntary component of the Defence Forces in peacetime, supporting the Permanent Defence Forces (PDF) in its domestic roles and training alongside its professional full-time colleagues as part of the "Single Force Concept" whereby RDF units are integrated with their PDF counterparts, coming under the one command. As of August 2024, there were 1,720 reservists out of an established strength of 4,096, consisting of 167 in the First Line Reserve, 1,456 in the Army Reserve, and 97 in the Naval Service Reserve.
Representative associations
The interests of members of the Defence Forces are represented by a number of representative associations, similar to trade unions (which Irish military personnel are banned from joining). Officer (armed forces), Officers of the PDF are represented by the Representative Association of Commissioned Officers, Other ranks (UK), Rank-and-file members of the PDF are represented by the Permanent Defence Force Other Ranks Representative Association (PDFORRA), which is affiliated to the Irish Conference of Professional and Service Associations and to the European Organisation of Military Associations, EUROMIL. In 2009, members of PDFORRA took part in an Irish Congress of Trade Unions protest against the government's handling of the post-2008 Irish economic downturn, at which time the
Department of Defence warned that Defence Forces members could not take part in or sponsor any "public agitation", and that PDFORRA had "no express permission" for members to take part in the protests. All ranks of the RDF are represented by the Reserve Defence Forces Representative Association (RDFRA).
Complaints concerning and made by serving and former members of the Defence Forces can be investigated by the independent Ombudsman for the Defence Forces, Office of the Ombudsman for the Defence Forces (ODF), in cases where internal grievance procedures within the DF have been exhausted.
Bases

The Defence Forces operate a number of military bases:
See also
*Military awards and decorations of Ireland
*Politics of the Republic of Ireland
*Ireland–NATO relations
*History of Ireland
*Irish neutrality
*Irish security forces
*Organisation of National Ex-Servicemen
*List of countries by military expenditures
*Irish Army deafness claims – a series of 17,000 personal injury claims taken by members of the Irish Defence Forces.
*Defence Force (disambiguation), Defence Force
*List of wars involving the Republic of Ireland
Notes
References
External links
Military.ie – Official website
{{Military of Europe, state=autocollapse
Military of the Republic of Ireland,
Department of Defence (Ireland)
Permanent Structured Cooperation