| Country | Military branches |
| Afghanistan | Afghan Armed Forces: Afghan National Army (ANA, includes Afghan Air Force (AAF)) (2011) |
| Akrotiri | void |
| Albania | Joint Force Command (includes Land, Naval, and Aviation Brigade Commands), Joint Support Command (includes Logistic Command), Training and Doctrine Command (2010) |
| Algeria | People's National Army (Armee Nationale Populaire, ANP), Land Forces (Forces Terrestres, FT), Navy of the Republic of Algeria (Marine de la Republique Algerienne, MRA), Air Force (Al-Quwwat al-Jawwiya al-Jaza'eriya, QJJ), Territorial Air Defense Force (2009) |
| American Samoa | void |
| Andorra | no regular military forces, Police Service of Andorra (2010) |
| Angola | Angolan Armed Forces (Forcas Armadas Angolanas, FAA): Army, Navy (Marinha de Guerra Angola, MGA), Angolan National Air Force (Forca Aerea Nacional Angolana, FANA; under operational control of the Army) (2011) |
| Anguilla | void |
| Antarctica | void |
| Antigua and Barbuda | Royal Antigua and Barbuda Defense Force (includes Antigua and Barbuda Coast Guard) (2011) |
| Arctic Ocean | void |
| Argentina | Argentine Army (Ejercito Argentino), Navy of the Argentine Republic (Armada Republica; includes naval aviation and naval infantry), Argentine Air Force (Fuerza Aerea Argentina, FAA) (2011) |
| Armenia | Armenian Armed Forces: Ground Forces, Air Force and Air Defense; "Nagorno-Karabakh Republic": Nagorno-Karabakh Self-Defense Force (NKSDF) (2011) |
| Aruba | no regular military forces (2010) |
| Ashmore and Cartier Islands | void |
| Atlantic Ocean | void |
| Australia | Australian Defense Force (ADF): Australian Army, Royal Australian Navy, Royal Australian Air Force, Special Operations Command (2006) |
| Austria | Land Forces (KdoLdSK), Air Forces (KdoLuSK) |
| Azerbaijan | Army, Navy, Air, and Air Defense Forces (2011) |
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