North Korea has organized a grand total of seven million men and women into reserve units. Reserve Military Training Unit, Worker-Peasant Militia, and the Young Red Guards make up most of the number. The units are managed by the Party Civil Defense Department in peacetime, but are placed under the Ministry of Defense in contingencies.
Reserve Military Training Unit form the core of the reserves and are under the command of the Ministry of Defense in peace AND in wartime. Party Civil Defense Departments keep track of the Worker-Peasant Militia and the Young Red Guards in peace time, but the Ministry of Defense in contingencies.
War mobilization measures usually assign Reserve Military Training Unit to the front or regional defense in war, while the other two units are assigned to maintain security in the rear, guard duty for important facilities, etc.
About 30% of all North Koreans between the ages fifteen to sixty are mobilized for reserve units:
To be more specific, Reserve Military Training Unit consist of approximately 1.7 million persons (men 17-45 and unmarried women 17-30) who are not either in active duty or important rear area personnel. They are mobilized under supervision of provincial military units, for a total of forty days' training out of the year.
The Worker-Peasant Militia is a combination of older men aged 45-60, along with men ages 17-45 and unmarried women ages 17-30 who are not included in Reserve Military Training Unit. They train for a total of thirty days out of the year. Their current numbers stand at 4.1 million.
The Young Red Guards consist of 1.2 million male and female Higher Middle (High) School students aged 14-16. They are subject to a mandatory four-hour drill session every Saturday and a total of 160 hours of on-campus drills annually. A total of 450 hours of off-campus training is also mandatory.