Flight deck helmets worn by U.S. Marines assigned to Marine Medium Tiltrotor Squadron (VMM) 263, are hung on a wall at Marine Corps Air Station New River, N.C., June 23, 2015. VMM-263 provided the aerial support platform, enabling Marine Special Operations Command Marines to complete their scheduled training. (U.S. Marine Corps photo by Lance Cpl. Jodson B. Graves/Released)