CAMP GRAYLING, Mich. – U.S. Marines with Echo Company, 4th Reconnaissance Battalion, 4th Marine Division, Marine Forces Reserve, execute a helocast exercise during exercise Northern Strike 17 in Lake Margrethe, Camp Grayling Joint Maneuver Training Center, Michigan on July 31, 2017. Helocasting is an airborne technique used by small units and special operations for insertion into military areas of operations. 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).