10/06/2026
The Chocolate Mountain Aerial Gunnery Range (CMAGR).
It is located immediately to the east and northeast of Slab City. While Slab City itself sits on the remains of the abandoned WWII Marine Corps base, Camp Dunlap, the land just across the Coachella Canal remains a very active military installation.
It is a primary training facility for the U.S. Marine Corps managed by Marine Corps Air Station Yuma or MCAS Yuma and the U.S. Navy. The range is a 459,000 acres (1,860 km2) open-area, approximately 20 miles wide, east to west, and 50 miles long, northwest to southeast, with a special-use airspace of 700 square miles (1,800 km2)[1] which is used for aerial bombing and live fire aerial gunnery practice. It straddles the northern portion of the Chocolate Mountains to the east of the Salton Sea in Imperial and Riverside counties, California, with restricted airspace in both California and Arizona. The boundary is roughly 1 to 3 miles east of the main residential "slabs." The Coachella Canal serves as a unofficial physical barrier between the community and the military land. Part of Bob Stump Training Range Complex Imperial County and Riverside County, California in the United States.
The range is used for live-fire aerial gunnery, bombing practice, and Naval Special Warfare training (including SEALs). The United States Department of Defense aviation combat crews have trained at the CMAGR and within its airspace since World War II. The CMAGR's live-fire aviation training ranges provide training for air combat maneuvering and tactics; air-to-air gunnery; airborne laser system operations; close air support; and air-to-ground bombing, strafing, and rocketry. The CMAGR also supports ground training to include air defense, air control, communications, demolition operations, as well as the support of small arms and artillery. The Naval Special Warfare Command also use a portion of the CMAGR for desert warfare training. Camp Billy Machen is a Navy SEAL desert warfare training facility, located on the edge of the Chocolate Mountains by Siphon 10 within CMAGR. Steel targets simulating Afghan insurgents stand at the Al Brutus training complex within target area 15 North. CMAGR also supports the Weapon and Tactics Instructor course (WTI). It is a seven-week period of instruction, hosted by Marine Aviation Weapons and Tactics Squadron 1 at MCAS Yuma, that incorporates Marine Corps planning and implementation of advanced air and ground tactics through a series of escalating evolutions in order to produce certified Weapons and Tactics Intructors. WTIs serve as squadron training officers who use their skills to act as aircraft and weapons subject matter experts to provide their units with proper training and evaluation to ensure exceptional combat readiness. Each course runs for seven weeks: WTI Class 1 (Fall): Runs from early September through late October. WTI Class 2 (Spring): Runs from March through late April. Each iteration consists of three weeks of intensive academic instruction followed by four weeks of practical flight and tactical operations, culminating in a final exercise (FINEX).
If you are in Slab City, it is common to hear and feel explosions and see low-flying aircraft during the day or observe flares at night.