Marines with 2nd Supply Battalion, 2nd Marine Logistics Group rehearses life-saving techniques on a fellow Marine during a Humvee Egress Assistance Trainer class at Camp Lejeune, N.C., Dec. 17, 2015. The HEAT class is designed to show Marines what to do if a vehicle rolls over during low visibility, no visibility, or experiences sideways or 180-degree rollovers. (U.S. Marine Corps photo taken by Cpl. Alexander Mitchell/released) - Marines with 2nd Supply Battalion, 2nd Marine Logistics Group rehearses life-saving techniques on a fellow Marine during a Humvee Egress Assistance Trainer class at Camp Lejeune, N.C., Dec. 17, 2015. The HEAT class is designed to show Marines what to do if a vehicle rolls over during low visibility, no visibility, or experiences sideways or 180-degree rollovers. (U.S. Marine Corps photo taken by Cpl. Alexander Mitchell/released)