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.
Korea under Japanese rule
On 10 December 1941, the Provisional Government of the Republic of Korea, under the presidency of Kim Gu, declared war on Japan and Germany. Kim Gu organized many of the exiled Korean resistance groups, forming the "Korean Liberation Army". On the other hand, Kim Il-sung led tens of thousands of Koreans who volunteered for the National Revolutionary Army and the People's Liberation Army. The communist-backed Korean Volunteer Army (KVA, 조선의용군, 朝鮮義勇軍) was established in Yenan, China, outside of the Provisional Government's control, from a core of 1,000 deserters from the Imperial Japanese Army. After the Manchurian Strategic Offensive Operation, the KVA entered Manchuria, where it recruited from the ethnic Korean population and eventually became the Korean People's Army of the Democratic People's Republic of Korea.