 It was redesignated as the 105th Fighter Interceptor Squadron on 1 March 1951 and assigned to Air Defense Command.While on active duty, it operated two geographically separated units; Detachment 1 flying P-47 Thunderbolt aircraft, from McGhee-Tyson Airport at Knoxville, Tennessee, provided air defense for the Atomic Energy Commission at Oak Ridge, and Detachment 2 was the 4674th Ground Observer Squadron, Smyrna, Tennessee.On 1 January 1953 the squadron was released from Federal Service and returned to the control of the State of Tennessee.