22nd Marine Expeditionary Unit force reconnaissance platoon Marines flash bang enemy role players as they clear a live-fire house during close quarters combat training at Tier 1 Group in Crawfordsville, Ark., June 30, 2013. The Marines completed more than 200 hours of advanced pistol, rifle, sniper, tactical driving, breaching and close quarters combat training throughout the 18-day course. (Marine Corps photo by Sgt. Austin Hazard/released) - 22nd Marine Expeditionary Unit force reconnaissance platoon Marines flash bang enemy role players as they clear a live-fire house during close quarters combat training at Tier 1 Group in Crawfordsville, Ark., June 30, 2013. The Marines completed more than 200 hours of advanced pistol, rifle, sniper, tactical driving, breaching and close quarters combat training throughout the 18-day course. (Marine Corps photo by Sgt. Austin Hazard/released)