| Country | Military service age and obligation |
| Chad | 20 years of age for conscripts, with 3-year service obligation; 18 years of age for volunteers; no minimum age restriction for volunteers with consent from a parent or guardian; women are subject to 1 year of compulsory military or civic service at age of 21 (2004) |
| Chile | 18-45 years of age for voluntary male and female military service, although the right to compulsory recruitment is retained; service obligation - 12 months for Army, 22 months for Navy and Air Force (2008) |
| China | 18-24 years of age for selective compulsory military service, with a 2 year service obligation; no minimum age for voluntary service (all officers are volunteers); 18-19 years of age for women high school graduates who meet requirements for specific military jobs; a recent military decision allows women in combat roles; the first class of women warship commanders was in training in 2011 (2011) |
| Christmas Island | void |
| Clipperton Island | void |
| Cocos (Keeling) Islands | void |
| Colombia | 18-24 years of age for compulsory and voluntary military service; service obligation - 18 months (2004) |
| Comoros | 18 years of age for 2-year voluntary military service; no conscription; women first inducted into the Army in 2004 (2011) |
| Congo, Democratic Republic of the | 18-45 years of age for voluntary military service (2009) |
| Congo, Republic of the | 18 years of age for voluntary military service; women allowed to serve (2011) |
| Cook Islands | void |
| Coral Sea Islands | void |
| Costa Rica | void |
| Cote d'Ivoire | 18-25 years of age for compulsory and voluntary male and female military service; voluntary recruitment of former rebels into the new national army is restricted to ages 22-29 (2011) |
| Croatia | 18-27 years of age for voluntary military service; 16 years of age with parental consent; 6-month service obligation; conscription abolished 1 January 2008 (2010) |
| Cuba | 17-28 years of age for compulsory military service; 2-year service obligation; both sexes subject to military service (2006) |
| Curacao | no conscription (2010) |
| Cyprus | Greek Cypriot National Guard (GCNG): 18-50 years of age for compulsory military service for all Greek Cypriot males; 17 years of age for voluntary service; women may volunteer for a 3-year term; length of service is 25 months (2009) |
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