Marine Aviation Training Support Group 21 was reactivated when which Navy base near Warrington was renamed?
Marine Aviation Training Support Group 21:  Squadrons from MAG-21 fought in many of the opening battles of the war to include the Battle of Wake Island, Battle of Midway and as part of the Cactus Air Force during the Battle of Guadalcanal The group was deactivated following the end of the war and was not reactivated until 2000 when the Marine Aviation Detachment at Naval Air Station Pensacola, Florida was renamed MATSG-21. Naval Air Station Pensacola: Naval Air Station Pensacola or NAS Pensacola (IATA: NPA, ICAO: KNPA, FAA LID: NPA) (formerly NAS/KNAS until changed circa 1970 to allow Nassau International Airport, now Lynden Pindling International Airport, to have IATA code NAS), "The Cradle of Naval Aviation", is a United States Navy base located next to Warrington, Florida, a community southwest of the Pensacola city limits.
Naval Air Station Pensacola