U.S. Marine Corps Lance Cpl. Levi W. Reaviel, left,

U.S. Marine Corps Lance Cpl. Levi W. Reaviel, left, a low altitude air defense gunner, and Gunnery Sgt. Samuel E. Cerritos, operations chief, both assigned to 2d Low Altitude Air Defense Battalion, Bravo Battery, receive reports from adjacent fire teams operating in support of Red Flag at Tonopah Test Range, Nev., July 22, 2015. Red Flag is an advanced aerial combat exercise to train U.S., NATO, and other allied countries for air combat situations. (U.S. Marine Corps photo by Cpl. Derek L. Picklesimer/Released)