| 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 | 17 years of age for compulsory military service; conscript service obligation - 2 years plus time for training (2001) |
| Anguilla | void |
| Antarctica | void |
| Antigua and Barbuda |  18 years of age for voluntary military service; no conscription (2008) |
| Arctic Ocean | void |
| Argentina |  18-24 years of age for voluntary military service (18-21 requires parental permission); no conscription (2001) |
| Armenia | 18-27 years of age for compulsory military service; 18 years of age for voluntary military service; 2-year conscript service obligation (2006) |
| 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 (2008) |
| Austria | 18-35 years of age for compulsory military service; 16 years of age for male or female voluntary service; service obligation 7 months of training, followed by an 8-year reserve obligation (2006) |
| 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) |
| Bahamas, The |  18 years of age (est.); no conscription (2008) |
| Bahrain |  17 years of age for voluntary military service; 15 years of age for NCOs, technicians, and cadets; no conscription (2008) |
| 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) |
| Barbados |  18 years of age for voluntary military service (younger requires parental consent); no conscription (2008) |
| Belarus | 18-27 years of age for compulsory military service; conscript service obligation - 18 months (2005) |
| Belgium |  18 years of age for voluntary military service; conscription suspended (2008) |
| 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) |
| Benin | 21 years of age for compulsory and voluntary military service; in practice, volunteers may be taken at the age of 18; both sexes are eligible for military service; conscript tour of duty - 18 months (2006) |
| Bermuda | 18-23 years of age; eligible men required to register for conscription as needed into the Bermuda Regiment, which is largely voluntary; term of service 39 months (2007) |
| Bhutan |  18 years of age for voluntary military service; no conscription (2008) |
| Bolivia |  18 years of age for 12-month compulsory military service; when annual number of volunteers falls short of goal, compulsory recruitment is effected, including conscription of boys as young as 14; 15-19 years of age for voluntary premilitary service, provides exemption from further military service (2008) |
| Bosnia and Herzegovina | 17 years of age for voluntary military service in the Federation and in the Republika Srpska; conscription abolished January 2006; 4-month service obligation (2006) |