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. Enhanced terminal voice switches provide air traffic controllers access to telephone lines, air-ground radios and intercommunications. (U.S. Air Force photo by Airman 1st Class Christopher Tam)
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