Staff Sgt. Tiffany Degracia, 36th Operations Support Squadron air traffic controller, signals a vehicle on the flightline with a light gun June 2, 2016, at Andersen Air Force Base, Guam. The light guns flash red, white or green lights in various patterns to signal how to proceed when communication with an aircraft or vehicle is lost. (U.S. Air Force photo by Airman 1st Class Jacob Skovo)
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