CAMP GRAYLING, Mich. - A Sikorsky UH-60 Black Hawk with Alpha Company, 1st Battalion, 168th Infantry Regiment, 34th Infantry Division transfers U.S. Marines with Bravo Company, 1st Battalion, 25th Marine Regiment, 4th Marine Division, Marine Forces Reserve as a part of helo operation drills at Camp Grayling Joint Maneuver Training Center, Michigan on Aug. 2, 2017. 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).