Los Alamitos ("The Little Cottonwoods" in Spanish) is a small city in Orange County, California. The city was incorporated in March 1960. The population was 11,536 at the 2000 census. It is often mistakenly thought to include the adjacent but unincorporated community of Rossmoor (population just under 11,000) which uses Los Alamitos as its mailing address. Although Rossmoor is not part of Los Alamitos, it is speculated that it may be annexed to the city, or Rossmoor, Seal Beach, and Los Alamitos will combine to form one city. The USA Water Polo National Aquatic Center, where the men's and women's US Olympic water polo team train, is located on the US Military Joint Forces Training Base in Los Alamitos. The facility is also used for major water polo tournaments, swim classes and local swim teams. The Joint Forces Training Base includes the Los Alamitos Army Airfield.