A Marine with 5th Battalion, 11th Marine Regiment, 1st Marine Division, loads an electronic M2 .50-caliber machine gun in a Combat Convoy Simulator at Marine Corps Base Camp Pendleton, California, Feb. 2, 2016. The CCS at first glance looks like an expensive, high-tech video game, but its primary use is preparing Marines for real-world combat missions with simulations of realistic scenarios. - A Marine with 5th Battalion, 11th Marine Regiment, 1st Marine Division, loads an electronic M2 .50-caliber machine gun in a Combat Convoy Simulator at Marine Corps Base Camp Pendleton, California, Feb. 2, 2016. The CCS at first glance looks like an expensive, high-tech video game, but its primary use is preparing Marines for real-world combat missions with simulations of realistic scenarios.