Conscription in South Korea
Conscription in South Korea has existed since 1957 and requires male citizens between the ages of 18 and 28 to perform in the army compulsory military service. Women are not required to perform military service, but may voluntarily enlist.
Demographics of North Korea
Based on the figures provided by the Central Statistics Bureau, Eberstadt and Banister estimate that the actual size of the "hidden" male North Korean military had reached 1.2 million by 1986 and that the actual male-to-female ratio was 97.1 males to 100 females in 1990. If their estimates are correct, 6.1 percent of North Korea's total population was in the military, numerically the world's fifth largest military force, in the late 1980s (fourth largest ).