word | | Military service age and obligation |
| age | Timor-Leste | 18 years of age for voluntary military service; no conscription (2008) |
| age | Togo | 18 years of age for selective compulsory and voluntary military service; 2-year service obligation (2006) |
| age | Tonga | 18 years of age (est.); no conscription (2008) |
| age | Trinidad and Tobago | 18 years of age for voluntary military service (16 years of age with parental consent); no conscription (2008) |
| age | Tunisia | 20 years of age for compulsory military service, 18 years of age for voluntary military service; 1-year conscript service obligation (2007) |
| age | Turkey | 20 years of age (2004) |
| age | Turkmenistan | 18-30 years of age for compulsory military service; 2-year conscript service obligation (2007) |
| age | Uganda | 18-26 years of age for compulsory and voluntary military duty; 18-30 years of age for professionals; 9-year service obligation; the government has stated that recruitment below 18 years of age could ... |
| age | Ukraine | 18-25 years of age for compulsory and voluntary military service; conscript service obligation - 18 months for Army and Air Force, 24 months for Navy (2004) |
| age | United Arab Emirates | 18 years of age (est.) for voluntary military service; 18 years of age for officers and women; no conscription (2008) |
| age | United Kingdom | 16-33 years of age (officers 17-28) for voluntary military service (with parental consent under 18); women serve in military services, but are excluded from ground combat positions and some naval postings; must ... |
| age | United States | 18 years of age (17 years of age with parental consent) for male and female voluntary service; maximum enlistment age 42 (Army), 27 (Air Force), 34 (Navy), 28 (Marines); service obligation 8 ... |