 The problem was deemed too widespread to justify the economic repair of the aircraft, and it was decided to retire the ANG's fleet of F-84Fs and replace them with more modern aircraft.In 1972 the 170th F-84s were given a 2G ferry flight permit to the Aerospace Maintenance and Regeneration Center at Davis-Monthan Air Force Base, the 170th having the distinction of flying the F-84F longer than any other USAF/ANG squadron.In January, 1972, the 183d Fighter Group was the first Air National Guard unit to receive the McDonnell F-4C Phantom II, with its aircraft being Vietnam War aircraft that were returning from Southeast Asia.