The 56-year history of the Alameda Naval Air Station from 1940 to 1997 was a major military presence in the San Francisco Bay Area. As one of the largest and most important naval air stations in the United States, with a population of 45,000, it occupied 300 buildings to service squadrons and Carrier Air Groups. The large Overhaul and Repair facility operated from 1941 through the jet age, and U.S. Naval Reserve squadrons were added in the postwar years.