word | | Military service age and obligation |
| age | Romania | 18-35 years of age for male and female voluntary military service; conscription officially ended October 2006; all military inductees (including women) contract for an initial 5-year term of service, with subsequent ... |
| age | Russia | 18-27 years of age for compulsory or voluntary military service; males are registered for the draft at 17 years of age; service obligation - 1 year; reserve obligation to age 50; as of ... |
| age | Rwanda | 18 years of age for voluntary military service; no conscription (2008) |
| age | Saint Kitts and Nevis | 18 years of age for voluntary military service; no conscription (2008) |
| age | Sao Tome and Principe | 18 years of age (est.) (2004) |
| age | Saudi Arabia | 18 years of age (est.); no conscription (2004) |
| age | Senegal | 18 years of age for compulsory and voluntary military service; conscript service obligation - 2 years (2004) |
| age | Serbia | 19-35 years of age for male compulsory military service; under a state of war or impending war, conscription can begin at age 16; conscription is to be abolished in 2010; 6-month ... |
| age | Seychelles | 18 years of age for voluntary military service (younger with parental consent); no conscription (2008) |
| age | Sierra Leone | 17 years 6 months of age for voluntary military service (younger with parental consent); no conscription (2008) |
| age | Singapore | 18-21 years of age for male compulsory military service; 16 years of age for volunteers; 2-year conscript service obligation, with a reserve obligation to age 40 (enlisted) or age 50 (officers ... |
| age | Slovakia | 17-30 years of age for voluntary military service; conscription abolished in 2006; women are eligible to serve (2007) |
| age | Slovenia | 17 years of age for voluntary military service; conscription abolished in 2003 (2007) |