WThe 6th Weapons Squadron is an active United States Air Force unit. It is assigned to the USAF Weapons School, based at Nellis Air Force Base, Nevada. It was previously assigned to the Seventh Air Force, being inactivated at Yokota Airfield, Japan on 20 February 1947.
WThe 348th Night Fighter Squadron is an inactive United States Air Force unit. Its last assignment was with the 481st Night Fighter Operational Training Group at Salinas Army Air Base, California. The unit was disbanded on 31 March 1944.
WThe 349th Night Fighter Squadron is an inactive United States Air Force unit which specialized in training airmen to utilize night fighters as nighttime interceptors. Its last assignment was with the 481st Night Fighter Operational Training Group, based at Hammer Field, California. First activated in October of 1942, the unit was inactivated on 31 March 1944.
WThe 414th Combat Training Squadron is a United States Air Force unit assigned to the 57th Wing at Nellis Air Force Base, Nevada. The 414th is a non-flying organization charged with hosting Red Flag exercises, Air Combat Command's largest Large Force Exercise (LFE).
WThe 415th Special Operations Squadron is a United States Air Force unit. It is assigned to the 58th Operations Group at Kirtland Air Force Base, New Mexico.
WThe 416th Fighter Squadron is an inactive United States Air Force unit. Its last assignment was with the 49th Fighter Wing at Holloman Air Force Base, New Mexico. The squadron was inactivated on 1 July 1993.
WThe 417th Test and Evaluation Squadron is an active United States Air Force unit, assigned to the 53rd Test and Evaluation Group and stationed at Edwards Air Force Base, California. Its previous assignment was with the USAF Weapons School at Holloman Air Force Base, New Mexico, where it was inactivated on 14 September 2006.
WThe 418th Tactical Fighter Training Squadron is an inactive United States Air Force unit. Its last assignment was with the 58th Tactical Fighter Training Wing, being inactivated at Luke Air Force Base, Arizona on 1 October 1976.
WThe 419th Night Fighter Squadron is an inactive United States Air Force unit. Its last assignment was with Thirteenth Air Force, being inactivated at Floridablanca, Luzon on 20 February 1947.
WThe 420th Flight Test Flight is an inactive United States Air Force Reserve squadron. It was last assigned to the 413th Flight Test Group of Air Force Reserve Command at Phoenix-Mesa Gateway Airport, Arizona, where it was inactivated on 31 October 2007.
WThe 421st Fighter Squadron is part of the 388th Fighter Wing at Hill Air Force Base, Utah. It operates the Lockheed Martin F-35A aircraft conducting air superiority missions. The squadron is one of the most decorated fighter squadrons in the United States Air Force, being awarded three Presidential Unit Citations and seven Air Force Outstanding Unit Awards for Valor in Combat.
WThe 422d Test and Evaluation Squadron is a United States Air Force unit. It is assigned to the 53d Test and Evaluation Group, stationed at Nellis Air Force Base, Nevada. The squadron performs operational testing of all fighter aircraft and munitions entering and in operational use by Air Combat Command.
WThe 45th Reconnaissance Squadron is a United States Air Force unit. It is assigned to the 55th Operations Group and stationed at Offutt Air Force Base, Nebraska. It is one of the most decorated squadrons of the active duty United States Air Force with a combat record in three wars, and a peacetime record of vital contributions to worldwide reconnaissance, treaty monitoring, and pilot proficiency training.
WThe 424th Tactical Air Support Training Squadron is an inactive United States Air Force unit. Its last assignment was with the 68th Tactical Air Support Group at Eglin Air Force Base, Florida, where the unit was inactivated on 31 March 1944. The unit conducted crew training for special operations, then forward air control from 1970 through 1972.
WThe 425th Fighter Squadron is part of the 56th Operations Group at Luke Air Force Base, Arizona. It operates the General Dynamics F-16 Fighting Falcon aircraft conducting advanced fighter training for Republic of Singapore Air Force F-16 pilots.
WThe 426th Tactical Fighter Training Squadron is an inactive United States Air Force fighter squadron. Its last assignment was with the 405th Tactical Training Wing, being inactivated at Luke Air Force Base, Arizona, on 19 November 1990.
WThe 427th Special Operations Squadron is a specialized, covert unit of the United States Air Force. After reporter Andreas Parsch filed a Freedom of Information Act request, the Air Force told him the unit "support[s] training requirements … for infiltration and exfiltration." That is, it prepares troops for secretly slipping into and out of dangerous territory. The squadron is not listed by the Air Force Historical Research Agency. It is reported by the press to be stationed at Pope Field, North Carolina.
WThe 547th Intelligence Squadron is an active United States Air Force (USAF) unit. It is assigned to the 365th Intelligence, Surveillance and Reconnaissance Group, stationed at Nellis Air Force Base, Nevada. The squadron serves as the USAFs center for adversary tactics analysis; develops intelligence threat training programs; defines potential threats to the US, provides intelligence support to Air Combat Command's test and evaluation programs and live-fly exercises.
WThe 548th Combat Training Squadron is a United States Air Force squadron assigned to the 57th Operations Group at Fort Polk, Louisiana. It is geographically separated from the 57th, whose headquarters are at Nellis Air Force Base, Nevada. At Fort Polk, the squadron controls multi-service close air support and forward air control aircraft and tactical air control assets in combat exercises with the US Army Joint Readiness Training Center.
WThe 549th Combat Training Squadron is a non-flying United States Air Force unit. It is assigned to the 57th Operations Group, and is stationed at Nellis Air Force Base, Nevada. It conducts air support and air interdiction sorties in "Green Flag (West)" exercises to train USAF fighter pilots and the aerospace power component to the US Army's brigade combat training.
WThe 550th Fighter Squadron is an active United States Air Force unit. Its current assignment is with 56th Operations Group, at Kingsley Field, Oregon.