 However, the period of federalization for the 123d was expiring and in July 1952, the unit personnel were returned to the United States, the aircraft at RAF Manston being passed on to the active-duty 406th Fighter-Bomber Wing was activated in place.After returning from England, the unit re-formed at Louisville.Because most jet aircraft were still in USAF use, the squadron received F-51D Mustangs and initially returned to its pre-federalization air defense mission, being designated as a Fighter-Interceptor unit.