| Country | Military service age and obligation |
| Afghanistan | 22 years of age; inductees are contracted into service for a 4-year term (2005) |
| Akrotiri | void |
| Albania | 19 years of age (2004) |
| Algeria | 19-30 years of age for compulsory military service; conscript service obligation - 18 months (6 months basic training, 12 months civil projects) (2006) |
| American Samoa | void |
| Andorra | void |
| Angola | 20-45 years of age for compulsory and 18-45 years for voluntary male military service; conscript service obligation - 2 years; 20-45 years of age for voluntary female service; Angolan citizenship required; the Marinha de Guerra Angola (Navy, MgA) is entirely staffed with volunteers (2011) |
| Anguilla | void |
| Antarctica | void |
| Antigua and Barbuda | 18 years of age for voluntary military service; no conscription (2010) |
| Arctic Ocean | void |
| Argentina | 18-24 years of age for voluntary military service (18-21 requires parental consent); no conscription (2001) |
| Armenia | 18-27 years of age for voluntary or compulsory military service; 2-year conscript service obligation (2010) |
| Aruba | void |
| Ashmore and Cartier Islands | void |
| Atlantic Ocean | void |
| Australia | 17 years of age for voluntary military service (with parental consent); no conscription; women allowed to serve in Army combat units in non-combat support roles (2010) |
| Austria | registration requirement at age 17; males under the age of 35 must complete basic military training (6 month duration); males 17 to 50 years old in the militia or inactive reserve are subject to compulsory military service (2011) |
| Azerbaijan | men between 18 and 35 are liable for military service; 18 years of age for voluntary military service; length of military service is 18 months and 12 months for university graduates (2006) |
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