The 1951 UN Commission for the Unification and Rehabilitation of Korea (UNCURK) occurred as part of the Korean War. Many of the participating nations include those who participated in the United Nations Command.
It was disbanded in 1973.
References
See also UNCMAC - the UN Command Military Armistice Commission UNCOK - the UN Commission on Korea Neutral Nations Supervisory Commission - the international Korean Armistice Agreement monitoring entity