An amphibious assault vehicle plunges into the water portion of the Marine Corps' largest test track at Production Plant Barstow, Marine Depot Maintenance Command on Marine Corps Logistics Base Barstow. Vehicles are tested daily on the track to check their readiness. - An amphibious assault vehicle plunges into the water portion of the Marine Corps' largest test track at Production Plant Barstow, Marine Depot Maintenance Command on Marine Corps Logistics Base Barstow. Vehicles are tested daily on the track to check their readiness.