A U.S. Army AH-64D Apache helicopter taxis into the parking area at Ech Stagefield, Fort Rucker, Ala., May 22, 2013, as a second aircraft completes a final approach during the “bag” portion of the Apache helicopter course, when a student’s cockpit windows are completely covered. The goal is to force student pilots to fly the aircraft solely by reference to the AH64 Helmet Mounted Display, also known as Integrated Helmet and Display Sighting System (IHADSS). The IHADSS provides a monocular display of outside the aircraft via television or thermal sensor on the nose of the aircraft. (U.S. Army photo by Sgt. 1st Class Andrew Kosterman/Released)