On 15 March 1951, during the height of the Korean War, III Corps was again called to active duty at Camp Roberts, California. In April 1954, III Corps moved to Fort Hood, Texas, where it participated in a number of important exercises, either as director headquarters or as a player unit. It took command of the 1st Armored Division and the 4th Armored Division. The main purpose of these operations was the testing of new doctrines, organizations, and equipment. On 5 May 1959, the corps was again inactivated.