U.S. Marine Corps Lance Cpl. Marshal T. Alexander, an assistant gunner assigned to 2d Low Altitude Air Defense Battalion, aims an M16A4 rifle during Operation Rolling Thunder, at Fort Bragg, N.C., Oct. 24, 2014. The operation was held in order to better integrate the ground combat element with the aviation combat element in support of the Marine Air Ground Task Force. (U.S. Marine Corps photo by Lance Cpl. Koby I. Saunders/Released)