Lance Cpl. Vince Walls (left) and Lance Cpl. Alexander Banik (right), mortarmen with Lima Company, 3rd Battalion, 25th Marine Regiment, adjust a M224 60mm Mortar during Exercise Northern Strike at Camp Grayling, Mich., Aug. 7, 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)