500th Air Defense Group The 500th Air Defense Group is a disbanded United States Air Force ( USAF ) organization . Its last assignment was with the 4708th Air Defense Wing at Greater Pittsburgh Airport , Pennsylvania . It was last active on 18 August 1955 . The group was originally activated as a support group at the end of World War II and provided logistics and administrative support for the 67th Tactical Reconnaissance Group in Germany and the United States until 1946 , when the two groups were inactivated . The groups were activated again in 1947 , but the 500th was soon discontinued when the USAF reorganized its combat and support units on its bases into a single wing . The group was activated once again in 1953 , when ADC established it as the headquarters for a dispersed fighter - interceptor squadron and the medical , maintenance , and administrative squadrons supporting it . It was replaced in 1955 when ADC transferred its mission , equipment , and personnel to the 54th Fighter Group in a project that replaced air defense groups commanding fighter squadrons with fighter groups with distinguished records during World War II . History . World War II . The group was activated as the 500th Air Service Group shortly after V - E Day in a reorganization of Army Air Forces ( AAF ) support groups in which the AAF replaced Service Groups that included personnel from other branches of the Army and supported two combat groups with Air Service Groups including only Air Corps units . It was designed to support a single combat group . Its 918th Air Engineering Squadron provided maintenance that was beyond the capability of the combat group , its 742nd Air Materiel Squadron handled all supply matters , and its Headquarters & Base Services Squadron provided other support . It supported 67th Tactical Reconnaissance Group ( TRG ) in Germany and then returned to the US , where both groups were inactivated . Cold War . When the 67th TRG was reactivated in 1947 , the 500th Air Service Group once again activated to support it . It was inactivated and replaced by 67th Airdrome Group , 67th Station Medical Group , and 67th Maintenance & Supply Group in the experimental Wing / Base reorganization of 1947 ( Hobson Plan ) , which was designed to unify control at air bases The group was disbanded in 1948 . The group was reconstituted , redesignated as the 500th Air Defense Group , and activated at Greater Pittsburgh Airport 18 February 1953 with responsibility for air defense of Western Pennsylvania . It was assigned the 71st Fighter - Interceptor Squadron ( FIS ) , which was already stationed at Greater Pittsburgh Airport , and flying F - 86 Sabre s , as its operational component . The 71st FIS had been assigned directly to the 4708th Defense Wing . It also replaced the 81st Air Base Squadron as host organization for USAF portion of Greater Pittsburgh Airport . The group was assigned three squadrons to perform its support responsibilities . Inactivated and replaced by 54th Fighter - Interceptor Group in 1955 as part of ADC ' s Project Arrow , which was designed to bring back on the active list the fighter units which had compiled memorable records in the two world wars . The group was disbanded once again in 1984 . References . Bibliography . Further Reading