The U.S. Army's Antiaircraft Command, with both guns and missiles, was established on 1 July 1950 and was redesignated Army Air Defense Command on 21 March 1957 after all units were converted to missiles. Under these two headquarters, Army Antiaircraft Artillery units stationed at N-75L/C in Carrollton were D Battery, 56th AAA Regiment from March 1955 to September 1958, D Battery, 4th Battalion, 51st Regiment from September 1958 to July 1960, and A Battery, 4th Battalion, 59th Regiment from July 1960 to June 1961.