Chocolate Mountains Aerial Gunnery Range

Chocolate Mountains Aerial Gunnery Range
Name	Chocolate Mountains Aerial Gunnery Range
Location	Imperial County, Riverside County, California, United States
Coordinates	33°00′N 115°50′W
Type	Aerial gunnery and bombing range
Controlledby	United States Navy
Used	1940s–present

Chocolate Mountains Aerial Gunnery Range is a large live-fire aerial bombing and gunnery range located in southern California near the Colorado River and the Salton Sea. The range lies adjacent to the Chocolate Mountains (California) and serves as a training area for United States United States Navy and United States Marine Corps aviation units, as well as occasional United States Air Force and allied aircraft. The installation is notable for its restricted airspace, extensive safety corridors, and overlapping jurisdiction among federal, state, and tribal authorities.

History

The range traces origins to World War II-era expansion of air-to-ground training used by the United States Navy and United States Army Air Forces, paralleling activities at Naval Air Station El Centro, Marine Corps Air Station Yuma, and NAWS China Lake. Postwar Cold War developments linked the site to West Coast U.S. Navy readiness programs, carrier air wing training cycles associated with Carrier Air Wing Two (CVW-2), and ordnance testing connected to Bureau of Ordnance (United States Navy). Environmental and regulatory changes during the Environmental Protection Agency era and landmark cases related to military lands influenced operational constraints, overlapping with federal statutes such as the National Environmental Policy Act. Historic incidents and accidents during training prompted reviews by the Department of Defense and studies by agencies including the U.S. Fish and Wildlife Service.

Geography and Environment

Located within Imperial County, California and Riverside County, California, the range occupies desert terrain near the Salton Sea State Recreation Area, the Colorado Desert, and the northern reaches of the Sonoran Desert. Topography includes rugged ranges of the Chocolate Mountains, alluvial fans, and playa basins that link to the Salton Sink. The area supports flora and fauna monitored by the U.S. Fish and Wildlife Service and intersects habitat for species listed under the Endangered Species Act such as the desert tortoise and migratory birds protected under the Migratory Bird Treaty Act. Hydrology and dust generation in the basin are affected by regional features like the Lower Colorado River Valley and agricultural runoff from the Imperial Valley.

Ownership and Administration

Land control involves the United States Department of the Navy, with management coordination among Bureau of Land Management, California Department of Fish and Wildlife, and tribal entities including the Quechan Tribe and Cocopah Indian Tribe when ancestral lands and access corridors are implicated. Congressional oversight by committees such as the United States House Committee on Armed Services and appropriations monitored by the United States Senate Committee on Appropriations affect funding and policy. Legal authorities derive from federal property statutes, defense appropriations, and offices including the Naval Facilities Engineering Systems Command.

Facilities and Operations

Facilities include designated target areas, impact zones, spotting towers, ordnance storage areas, and restricted airspace coordinated through Federal Aviation Administration flight procedures and Notices to Airmen issued by Naval Air Systems Command and local FAA Flight Service Station operations. Support functions rely on nearby installations such as Naval Air Facility El Centro, Marine Corps Air Station Miramar, and range instrumentation integrated with range instrumentation contractors and agencies like Defense Logistics Agency for ordnance supply. Infrastructure considerations address desert corrosion, access via Interstate 8 and state highways, and emergency response coordinated with California Office of Emergency Services.

Military Use and Training Activities

The site hosts air-to-ground bombing, strafing, live-fire gunnery, and close air support exercises for platforms including F/A-18 Hornet, F/A-35 Lightning II, AV-8B Harrier II, and rotary-wing aircraft such as the AH-64 Apache. Training integrates joint exercises with Marine Air-Ground Task Force elements, carrier strike group readiness workups tied to USS Nimitz (CVN-68) deployments, and ordnance delivery certifications overseen by range control in accordance with Department of Defense Instructions. Allied partners from nations participating in exercises like RIMPAC or bilateral training missions also utilize the range under memorandum agreements and status of forces arrangements.

Environmental and Public Safety Concerns

Live-fire operations raise concerns addressed through environmental assessments under the National Environmental Policy Act and consultations under the Endangered Species Act and National Historic Preservation Act when cultural resources are present. Airspace restrictions and notam procedures mitigate risks to civil aviation overseen by the Federal Aviation Administration, while public safety involving unexploded ordnance and debris requires coordination with the Department of Defense Explosive Ordnance Disposal units. Community stakeholders including local governments in Imperial County, California and Riverside County, California, conservation organizations such as The Nature Conservancy, and tribal authorities participate in impact mitigation and remediation planning.

Cultural and Legal Issues

The range intersects lands with prehistoric and historic cultural sites subject to protections under the National Historic Preservation Act and treaties recognized by tribal nations including the Quechan Tribe of the Fort Yuma Indian Reservation. Legal disputes and consultations have involved agencies such as the Department of the Interior and courts interpreting federal trust responsibilities and access rights, echoing broader cases involving military land use and indigenous claims. Legislative oversight, litigation, and negotiated agreements continue to shape public access, cultural resource management, and operational constraints enforced by congressional delegations from California.

Category:Ranges of the United States Category:Military installations in California