Joint Security Area - Composition and Duties

Composition and Duties

The United Nations Command Security Battalion—Joint Security Area was constituted on May 5, 1952, as Army Unit 8020, United Nations Command Military Armistice Commission Support Group (Provisional). Originally authorized five officers and ten enlisted soldiers, the unit quickly grew to over 1,400 officers and men charged with supporting almost 32,000 soldiers, civilians, and diplomats involved in negotiating and then enforcing the Armistice Agreement. By the end of February 1954 the scope of work declined considerably and the number of soldiers assigned to the unit declined as well.

For the next fifty years the unit underwent several organizational and name changes, although the original mission to secure the Joint Security Area remains the same today as it was in 1952. On June 11, 1979, the name was changed from US Army Support Group (Joint Security Area) to United Nations Command Support Group—Joint Security Area, and further changed to United Nations Command Security Force—Joint Security Area on December 23, 1985. On October 15, 1994, UNC Commander directed that the unit be known by its present designation, the United Nations Command Security Battalion—Joint Security Area.

Originally a purely US Army organization, the unit almost immediately incorporated ROK soldiers (KATUSAs) into its ranks. In addition, ROK Army officers served as liaison officers. In the mid 1970s the JSA consisted of the JSF company with three platoons of one U.S. and one ROKA officer, and thirty enlisted men, supported by a battalion staff. The three platoons were led by the U.S. officer with the ROK officer being the executive officer, and US Army platoon sergeants. The platoons consisted of three squads, with equal numbers of U.S. and KATUSA soldiers.

Sometime after 1979, another (fourth) platoon was added to the JSF to allow time for training during platoon work rotations. In July 1987 the four platoons of the Joint Security Force (JSF) company were reorganized to mix KATUSA and US soldiers at all levels. At the platoon level, two platoons were led by US Army lieutenants and ROKA platoon sergeants, and two were led by ROKA lieutenants and US Army platoon sergeants. In November 1987 the unit received a ROK Army major as its first deputy commander.

On April 25, 1992, the JSF company became a KATUSA-pure formation. Captain Yin Sung-Hwan became the first ROK commander, assisted by a US Army lieutenant as his executive officer. The number of US Army personnel assigned to the unit fell below 200 for the first time since 1952. American forces assigned to the JSA assumed mainly administrative and support roles.

On October 31, 2004, a ROK Army battalion assumed responsibility for the Joint Security Area. This modified light infantry battalion consists of a battalion headquarters, a headquarters company, two security companies, and a civil affairs company. The number of US personnel assigned decreased further, reflecting the UNC Commander's desire to minimize the USFK presence near the Korean Demilitarized Zone. The commander of the ROKA JSA Battalion serves as the UNCSB-JSA Deputy Commander. The UNCSB-JSA Commander's principal responsibility now lies in his operational control of selected ROKA formations during both Armistice and wartime periods.

Both sides face each other in spaces between the blue meeting houses, where the demarcation line is marked by blocks of concrete. All South Korean guards in this area are armed with pistols, and stand in a modified Tae Kwon Do stance with solid facial expressions, clenched fists, and sunglasses, which is meant to intimidate the North Koreans. They must be at least 177 cm tall, and have a black belt in Tae Kwon Do or Judo to serve there. All North Korean border guards are armed with pistols, and are well-fed officers who stand in rigid military posture. In each space, two North Korean soldiers stand facing each other rather than the South, so that neither one can defect to the South, and another guard stands behind them facing the North to prevent anyone else from defecting. In front of him is a two-man guard post.