Marine Corps Lance Cpl. Jacob Cooper examines the condition of the lower receiver of an M16A4 rifle during a pre-fire inspection at Marine Corps Base Camp Pendleton, Calif., Jan. 8, 2018. Cooper is an armorer assigned to the Headquarters and Support Battalion. Before every live-fire range, limited technical inspections and pre-fire inspections are conducted, ensuring that each weapon is fully operational and cleared for use. Marine Corps photo by Lance Cpl. Dylan Chagnon