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Greek military personnel total 367,450, of whom 142,950 are active and 220,500 are reserve. Greece ranks 15th in the world in the number of citizens serving in the armed forces, due largely to compulsory military service for males between the ages of 19 and 45 (females are exempted from conscription but may otherwise serve in the military). Mandatory military service is one year for the Army and nine months for the Navy and Air Force.