Conscription in South Korea
By law, when a Korean man turns 18 years old, he is enlisted for "first citizen service," meaning he is liable for military duty, but is not yet required to serve. When he turns 19 years old (or, in some instances, 20 years old), he is required to undergo a physical exam to determine whether he is suitable for military service. The table below shows the physical exam's possible grades and their outcomes, according to the Military Service Act. Men must enlist by the time they turn 28 (Korean age).
The length of compulsory military service in South Korea varies based on military branch. Active duty soldiers serve 21 months in the Army or Marine Corps, 23 months in the Navy, and 24 months in the Air Force. After conscripts finish their military service, they are automatically placed on the reserve roster and are obligated to attend a few days of annual military training for 6 years.
Republic of Korea Reserve Forces
There are two major branches of the Reserve Forces: the Mobilization Reserve Forces (Korean: 동원예비군, Hanja: 動員豫備軍; Dongwon Yebigun) and the Homeland Reserve Forces (Korean: 향토예비군, hanja: 鄕土豫備軍; Hyangto Yebigun), a Home Guard type force. Soldiers who have completed their service in the Republic of Korea Armed Forces are automatically transferred to the Reserve Forces and must first serve 4 years in the Mobilization Reserve and then 4 years as an Homeland Reservist. During wartime, about 5 divisions would be formed under the Mobilization Reserves, and deployed to the war zone to provide support and regional stabilization. In the meantime, the Homeland Reserve would defend the homeland from any possible attacks from the enemy.