U.S. Air Force Tech. Sgt. Lan Nguyen, 57th Operations Support Squadron air traffic controller, uses an enhanced terminal voice switch to communicate to other local air control towers in the air traffic control tower Nov. 27, 2013, at Nellis Air Force Base, Nev. Air traffic controllers are people trained to maintain the safe, orderly and expeditious flow of air traffic in the global air traffic control system. (U.S. Air Force photo by Airman 1st Class Christopher Tam)
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