CAMP GRAYLING, Mich. - U.S. Marines with Bravo Company, 1st Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve provide security during a dry run of helo operations at Camp Grayling Joint Maneuver Training Center, Michigan on Aug. 2, 2017. Reserve Marines were training to seize key terrain, provide security and to directly engage enemy forces behind enemy lines after an insertion from an aircraft. Exercise Northern Strike is a National Guard Bureau-sponsored training exercise that unites service members from multiple branches, states and coalition countries to conduct combined ground and air combat operations. (U.S. Marine Corps photo by Lance Cpl. Imari J. Dubose/Released).