CAMP GRAYLING, Mich. – U.S. Marines from Echo Company, 4th Reconnaissance Battalion, 4th Marine Division, Marine Forces Reserve, prepare for a helocast exercise off of a U.S. Navy Sikorsky SH-60 Seahawk from Sea Combat Squadron 22, at Camp Grayling Joint Maneuver Training Center, Michigan, during exercise Northern Strike 17, 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. Niles Lee/Released)