The 520th Fighter-Interceptor Squadron is an inactive United States Air Force unit. Its last assignment was with 530th Air Defense Group, stationed at Geiger Field, Washington, where it was inactivated on 18 August 1955. The squadron was first activated during World War II as the 638th Bombardment Squadron, a dive bomber unit, but was disbanded before participating in combat in a general reorganization of Army Air Forces training units. It was reconstituted during the Cold War as a fighter interceptor unit supporting the air defense of the United States.

The 408th Armament Systems Group is an inactive United States Air Force (USAF) unit. Its last assignment was with Air Force Materiel Command's 308th Armament Systems Wing at Eglin Air Force Base, Florida. It was inactivated in 2010.