word | | Military service age and obligation |
| military | Angola | 22-24 years of age for compulsory military service; conscript service obligation - 2 years; Angolan citizenship required (2009) |
| military | Antigua and Barbuda | 18 years of age for voluntary military service; no conscription (2008) |
| military | Argentina | 18-24 years of age for voluntary military service (18-21 requires parental permission); no conscription (2001) |
| military | Armenia | 18-27 years of age for voluntary or compulsory military service; 2-year conscript service obligation (2007) |
| military | 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 (2008) |
| military | Austria | 18-35 years of age for compulsory military service; 16 years of age for male or female voluntary service; service obligation 6 months of training, followed by an 8-year reserve obligation (2008) |
| military | 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) |
| military | Bahrain | 17 years of age for voluntary military service; 15 years of age for NCOs, technicians, and cadets; no conscription (2008) |
| military | Bangladesh | 16 years of age for voluntary military service; 17 years of age for officers (both with parental consent); conscription legally possible in emergency, but has never been implemented (2008) |
| military | Barbados | 18 years of age for voluntary military service (younger requires parental consent); no conscription (2008) |
| military | Belarus | 18-27 years of age for compulsory military service; conscript service obligation - 18 months (2005) |
| military | Belgium | 18 years of age for voluntary military service; conscription suspended (2008) |
| military | Belize | 18 years of age for voluntary military service; laws allow for conscription only if volunteers are insufficient; conscription has never been implemented; volunteers typically outnumber available positions by 3:1 (2008) |