| Country | Military service age and obligation |
| Bahamas, The | 18 years of age; no conscription (2010) |
| Bahrain | 17 years of age for voluntary military service; 15 years of age for NCOs, technicians, and cadets; no conscription (2010) |
| Bangladesh | 16 years of age for voluntary enlisted military service (Air Force); 17 years of age (Army and Navy); conscription is by law possible in times of emergency, but has never been implemented (2010) |
| Barbados | 18 years of age for voluntary military service (younger volunteers require parental consent); no conscription (2009) |
| Belarus | 18-27 years of age for compulsory military service; conscript service obligation - 12-18 months, depending on academic qualifications (2010) |
| Belgium | 18 years of age for voluntary military service; conscription suspended (2010) |
| Belize | 18 years of age for voluntary military service; law allows for conscription only if volunteers are insufficient; conscription has never been implemented; volunteers typically outnumber available positions by 3:1 (2008) |
| Benin | 18-35 years of age for selective compulsory and voluntary military service; a higher education diploma is required; both sexes are eligible for military service; conscript tour of duty - 18 months (2011) |
| Bermuda | 18-30 years of age for voluntary or compulsory enlistment in the Bermuda Regiment; males must register at age 18; term of service is 38 months (2009) |
| Bhutan | 18 years of age for voluntary military service; no conscription (2010) |
| Bolivia | 18-49 years of age for 12-month compulsory male and female 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 (2011) |
| Bosnia and Herzegovina | 18 years of age for voluntary military service; conscription abolished in January 2006; 4-month service obligation; mandatory retirement at age 35 or after 15 years of service (2010) |
| Botswana | 18 is the apparent age of voluntary military service; official minimum age is unknown (2001) |
| Bouvet Island | void |
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