U.S. Marine Corps Lance Cpl. Nathan Long, a combat

U.S. Marine Corps Lance Cpl. Nathan Long, a combat engineer with Bravo Company, 7th Engineer Support Battalion, 1st Marine Logistics Group, compresses a C-4 explosive block in preparation for a breaching and demolition training exercise at Camp Pendleton, Calif., Sept. 19, 2017. The Marines of Bravo Company, 7th ESB demonstrate their capabilities by producing field-expedient explosives. The Marines of Bravo Company demonstrate their capabilities by producing field-expedient explosives that are used in various situations such as destroying structures, equipment, or heavy weapons. (U.S. Marine Corps photo by Lance Cpl. Roderick Jacquote)