U.S. Air Force Tech. Sgt. Katherine Eliason, 57th Operations Support Squadron air traffic controller watch supervisor, uses a traffic counter switch in the air traffic control tower Nov. 27, 2013, at Nellis Air Force Base, Nev. Air traffic controllers apply separation rules to keep aircraft at a safe distance from each other in their area of responsibility. Traffic counter switches are used to log how many aircraft landings and take-offs there are during the day. (U.S. Air Force photo by Airman 1st Class Christopher Tam)
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