Sgt. Rick Asking, training non-commissioned officer in charge with Alpha Company, 4th Assault Amphibious Battalion, signals for an amphibious assault vehicle to enter a lake during Exercise Northern Strike at Camp Grayling, Mich., Aug. 8, 2018. Camp Grayling, the largest National Guard center in the country covering 147,000 acres, offers many large artillery, mortar, tank ranges and maneuver courses. (U.S. Marine Corps photos by Cpl. Niles Lee)