The first ADC flying unit to arrive was the 325th Fighter-Interceptor Group, which arrived on 26 November 1948. The mission of the 325th FIG was to conduct ADC's All Weather Combat Crew Training School. Its operational component, the 317th Fighter Interceptor Squadron, initially flew Northrop P-61 Black Widows, almost immediately transitioning to the North American F-82 Twin Mustang. A second squadron, the 319th Fighter Interceptor Squadron arrived on 2 September 1949, being reassigned from McChord AFB. The 319th also flew the F-82 Twin Mustang. The 325th FIG remained at Moses Lake until being reassigned to McChord AFB on 23 April 1950, along with the 317th FIS. The 319th remained until 9 February 1952 when it was reassigned to Suwon Air Base, South Korea flying F-94 Starfires.