| 520th Air Defense Group | |
|---|---|
 | |
| Active | 1944–1945, 1953–1955 |
| Country |  United States |
| Branch |  United States Air Force |
| Type | Fighter interceptor |
| Role | Air Defense |
The 520th Air Defense Group is a disbanded United States Air Force organization. Its last assignment was with the 4706th Air Defense Wing at Truax Field, Wisconsin, where it was inactivated in 1955. The group was originally activated as the 520th Air Service Group, a support unit for the 340th Bombardment Group at the end of World War II in Italy and then redeployed to the United States where it was inactivated in 1945.
The group was activated once again in 1953, when Air Defense Command (ADC) established it as the headquarters for a dispersed fighter-interceptor squadron and the medical, aircraft maintenance, and administrative squadrons supporting it. It was replaced in 1955 when ADC transferred its mission, equipment, and personnel to the 327th Fighter Group in a project that replaced air defense groups commanding fighter squadrons with fighter groups with distinguished records during World War II.
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