word | | Military service age and obligation |
| military | 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 ... |
| military | Bhutan | 18 years of age for voluntary military service; no conscription (2008) |
| military | Bolivia | 18-49 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 ... |
| military | Bosnia and Herzegovina | 18 years of age for voluntary military service; conscription abolished January 2006; 4-month service obligation (2009) |
| military | Botswana | 18 is the apparent age of voluntary military service; the official qualifications for determining minimum age are unknown (2001) |
| military | Brazil | 21-45 years of age for compulsory military service; conscript service obligation - 9 to 12 months; 17-45 years of age for voluntary service; an increasing percentage of the ranks are "long-service" volunteer ... |
| military | Brunei | 18 years of age (est.) for voluntary military service; non-Malays are ineligible to serve (2007) |
| military | Bulgaria | 18-27 years of age for voluntary military service; as of May 2006, 67% of the Bulgarian Army comprised of professional soldiers; conscription ended January 2008; Air Forces and Naval Forces became fully ... |
| military | Burkina Faso | 18 years of age for voluntary military service; women may serve in supporting roles (2009) |
| military | Burma | 18 years of age for voluntary military service for both sexes; forced conscription of children, although officially prohibited, reportedly continues (2007) |
| military | Burundi | 16 years of age for compulsory and voluntary military service; children as young as 10 years of age have been conscripted into the armed forces; the enrollment of children is still not ... |
| military | Cambodia | conscription law of October 2006 requires all males between 18-30 to register for military service; 18-month service obligation (2006) |