Lance Cpl. Samuel T. Mahaffey, a motor vehicle operator with 8th Engineer Support Battalion, fires a practice M2 .50-caliber machine gun during a convoy operations training simulation at Marine Corps Base Camp Lejeune, N.C., Feb. 9, 2016. Throughout the simulation, vehicle gunners practiced using the M2 .50-caliber machine gun and Mk-19 automatic grenade launcher. - Lance Cpl. Samuel T. Mahaffey, a motor vehicle operator with 8th Engineer Support Battalion, fires a practice M2 .50-caliber machine gun during a convoy operations training simulation at Marine Corps Base Camp Lejeune, N.C., Feb. 9, 2016. Throughout the simulation, vehicle gunners practiced using the M2 .50-caliber machine gun and Mk-19 automatic grenade launcher.