U.S. Marine Corps Cpl. John M. Stidman, an armorer

U.S. Marine Corps Cpl. John M. Stidman, an armorer with III Marine Headquarters Group, takes apart a M16A4 rifle during Command Post Exercise (CPX) 16 on Okinawa, Japan, Feb. 2, 2016. CPX 16 is conducted to improve the III MEF’s capabilities in intelligence and logistic operations, future planning, and combat readiness. (U.S. Marine Corps photo by MCIPAC Combat Camera Lance Cpl. Damon A. Mclean / Released)