two-year commitment 英語版 mandatory military service civil service posting mandatory military service mandatory military service non-active duty service male conscription compulsory military service 위키백과 South Korea mandatory military service military service English mandatory military service military service mandatory military service mandatory military service mandatory military service the longest conscription periods non-active duty service the longest conscription periods male conscription mandatory military service non-active duty service non-active duty service non-active duty service mandatory service in the South Korean military the longest conscription periods male conscription mandatory military service universal male conscription mandatory military service mandatory military service mandatory military service mandatory military service mandatory military service mandatory military service non-active duty service non-active duty service non-active duty service conscription mandatory military service mandatory military service non-active duty service Conscription in South Korea non-active duty service the longest conscription periods non-active duty service non-active duty service