Camp Clipper and Camp Essex were subcamps of the US Army's Desert Training Center in San Bernardino County, California, located near Historic Route 66 and the Santa Fe Railway. The main headquarters for the Desert Training Center was Camp Young. This is where General George S. Patton's 3rd Armored Division was stationed. Camp Clipper was designated a California Historic Landmark (No.985.5). The site of Camp Clipper is now located near the Fenner Rest Area in Fenner, California, on Interstate 40 and Route 66, 32 miles (51 km) west of Needles in San Bernardino County, California, near the Clipper Mountains. Currently at the south end of the Mojave National Preserve. Camp Clipper was just to the east of Camp Essex. Clipper was a temporary camp for incoming and outgoing troops. Camp Essex was named after a small town near the camp, Essex. Near Camp Clipper was the 4,500 foot Camp Essex Army Airfield.

The Desert Training Center (DTC), also known as California–Arizona Maneuver Area (CAMA), was a World War II training facility established in the Mojave Desert and Sonoran Desert, largely in Southern California and Western Arizona in 1942.