Lance Cpl. Grant R. Burch, a rifleman with Charlie Company, 1st Battalion, 24th Marine Regiment, 4th Marine Division, Marine Forces Reserve, simulates clearing a room during urban warfare training during Exercise Arctic Eagle at Camp Grayling, Mich., April 24, 2014. Marines joined members of the Army National Guard and the Danish Home Guard at the exercise to train counterinsurgency tactics and urban warfare. (U.S. Marine Corps photo by Cpl. Ian Leones/Released)