A Marine with 2nd Supply Battalion, 2nd Marine Logistics Group puts on knee pads before a Humvee Egress Assistance Trainer class at Marine Corps Base 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. - A Marine with 2nd Supply Battalion, 2nd Marine Logistics Group puts on knee pads before a Humvee Egress Assistance Trainer class at Marine Corps Base 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.