Conscription in South Korea
The basis for military conscription in South Korea is the Constitution of the Republic of Korea, which was promulgated on July 17, 1948. The constitution states in Article 39, "All citizens shall have the duty of national defense under the conditions as prescribed by Act." The Military Service Act of 1949, which was implemented in 1957, specified that compulsory military service is required for men ages 19 or older. Conscription is managed by the Military Manpower Administration, which was created in 1948.
United States Army Recruiting Command
Although the STASA was extended after the war, it ended on 31 March 1947, and the Army had to turn to recruiting volunteers again, requiring and estimated 30,000 volunteers a month, but seeing only 12,000 enlisting.
With the Cold War looming, the Congress authorised the Selective Service Act of 1948 to enable President Truman to provide for 21 months of active Federal service, with all men from ages 18 to 26 required to register. This Act was extended due to the start of the Korean War, and replaced by the Universal Military Training and Service Act of 1951 by revising the earlier Act. 
The new Act extended the president’s authority to induct citizens for four years, granted him the authority to recall reservists, lowered the draft age to 18, lengthened the term of service to two years, and cancelled deferments for married men without children.
With the end of the Korean War, the draft remained in force, but became increasingly unpopular although it continued to encourage volunteers and selected the bare minimum of annual recruits. Repeatedly renewed by overall majorities in Congress in 1955, 1959, and 1963, its final extension in 1967 was also passed by a majority of Congress, but only after a year of hearings and public debate. The U.S. Army became an all-volunteer force again in 1973. During the years of the Vietnam War between From 1965 to 1973, there were 1,728,254 inductions through selective service. There was however a direct effect on public support for the draft that was high even after the Korean War to its low in early 1970s because 
Draftees, who constituted only 16 percent of the armed forces, but 88 percent of infantry soldiers in Vietnam, accounted for over 50 percent of combat deaths in 1969, a peak year for casualties. Little wonder that the draft became the focus of anti-Vietnam activism.
With these political consequences in mind in 1969 President Nixon appointed a commission, led by former Secretary of Defense Thomas Gates, "to develop a comprehensive plan for eliminating conscription and moving toward an All Volunteer Armed Force." However, even before this commission submitted its report on 13 May 1969, President Nixon informed the Congress that he intended to institute a reform that would see the draftees replaced with volunteers in his Special Message to Congress on Reforming the Military Draft. In February 1970, the Gates Commission released its favorable AVF report, which stated that 
"We unanimously believe that the nation’s interests will be better served by an all-volunteer force, supported by an effective stand-by draft, than by a mixed force of volunteers and conscripts; that steps should be taken promptly to move in this direction."
Facilitating the transition to an all-volunteer force, the Army created District Recruiting Commands (DRC) through the continental United States to direct the efforts of its recruiters among the civilian population. The DRC's became "Battalions" in 1983.