Capt. Greg Johnston, 40th Helicopter Squadron UH-1N Iriquois pilot, checks a topographical map for obstacles in the flight path July 6, 2016, near Malmstrom Air Force Base, Mont. Pilots and flight engineers refer to the map when routing flight paths especially when they encounter obstacles such as weather or restricted air space. (U.S. Air Force photo/Staff Sgt. Delia Marchick)