Borrego Valley Maneuver Area also called the Borrego Springs Naval Maneuver Area was a US Army Anti-Aircraft Training Center (AARTC) and a subcamp of Camp Callan. Located near Borrego Springs, California in San Diego County in the Imperial Valley. Opened in March 1942 and in use until August 1944, it was operated by the Western Defense Command. Marine Corps also used the site to train troops in driving army vehicles. The site was picked as it was 400 square miles, 255,840 acres, of barren desert, barren mountains, and badlands. When closed the land returned to the State of California. Built at the site were bombing stations, strafing stations, and rocket targets. Also installed was Anti-Aircraft Artillery for training. First week troop did dry run training and the second week live-fire tra