Members of the Danish Home Guard receive a safety brief prior to conducting urban warfare training at Camp Grayling, Mich., April 24, 2015. The troops joined the 24th Marine Regiment and the Michigan Army National Guard's 272nd Regional Support Group for Exercise Arctic Eagle, a joint service and international exercise designed to improve urban patrolling, stability operations and counterinsurgency tactics. (U.S. Marine Corps photo by Cpl. Ian Leones/Released)