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.
North Korea
The Korean People's Army (KPA) is North Korea's military organization. The KPA has 1,106,000 active and 8,389,000 reserve and paramilitary troops, making it the largest military institution in the world. About 20 percent of men aged 17–54 serve in the regular armed forces, and approximately one in every 25 citizens is an enlisted soldier. The KPA has five branches: Ground Force, Navy, Air Force, Special Operations Force, and Rocket Force. Command of the Korean People's Army lies in both the Central Military Commission of the Workers' Party of Korea and the independent State Affairs Commission. The Ministry of People's Armed Forces is subordinated to the latter.