 The unit was reactivated at Selfridge Field, Michigan, 9 September 1946, as the United States began to rearm due to Cold War pressures.On 15 August 1947, under the Wing/Base (Hobson) reorganization plan, the 4th Fighter Wing was formed, and the 4th Fighter Group became its subordinate operational flying component.Following a period of training with F-80 Shooting Star aircraft, the 4th Fighter Group transitioned to F-86 Sabre jets in March 1949, just in time for advanced training and entry into the Korean War.