On 1 September 1991, the third wing to hold the "310" designation, the 310th Training and Test Wing (310 TTW), assumed the ICBM testing and training mission from the Strategic Missile Center (the former 1st Strategic Aerospace Division) at Vandenberg AFB, California under the Twentieth Air Force. After the removal of ICBMs from alert status at the end of the Cold War, the wing continued to train Minuteman crews and to test accuracy and reliability of Minuteman and Peacekeeper missiles. The 310 TTW also assisted in testing the Global Positioning System (GPS) from April 1992 – May 1992. It was reassigned to Air Combat Command on 31 May 1992. It was inactivated on 1 July 1993.
