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)

Lance Cpl. Luis Muniz, a motor transport operator with Transportation Support Co., Combat Logistics Battalion 2, mans a M240G Machine Gun during simulated High Mobility Multipurpose Wheeled Vehicle convoy training at Camp Lejeune, N.C., Oct. 7, 2015. Marines with the unit are undergoing Convoy Leader’s Course in preparation for an Integrated Training Exercise in Twentynine Palms, Calif., later this month. (U.S. Marine Corps photo by Cpl. Lucas Hopkins/Released) - Lance Cpl. Luis Muniz, a motor transport operator with Transportation Support Co., Combat Logistics Battalion 2, mans a M240G Machine Gun during simulated High Mobility Multipurpose Wheeled Vehicle convoy training at Camp Lejeune, N.C., Oct. 7, 2015. Marines with the unit are undergoing Convoy Leader’s Course in preparation for an Integrated Training Exercise in Twentynine Palms, Calif., later this month. (U.S. Marine Corps photo by Cpl. Lucas Hopkins/Released)