English: "Airman 1st Class Patrick Ayoung, 1st Special Operations Support Squadron air traffic control apprentice, uses a signal light gun at the base flight tower on Hurlburt Field, Fla., July 17, 2014. Signal lights are used to direct planes, day or night, in case of a radio failure and aircraft not equipped with a radio. (U.S. Air Force photo/Senior Airman Kentavist P. Brackin)"[1]. For more about signal light guns, see
/info/en/?search=Aviation_light_signals
[1]
http://www.hurlburt.af.mil/News/Photos.aspx?igphoto=2000831737
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