Twentynine Palms Marine Corps Air-Ground Combat Center, California

The largest, in area, Marine Corps facility in the country. Within the area's 932 square miles, military training and weapons testing is performed in association with other branches of the Armed Forces. 50,000 marines train at the Marine Corps Air-Ground Combat Center every year. The base has over 1,000 structures, most located in the community of Mainside, and employs around 11,000 military and civilian personnel.