HOLLOMAN AIR FORCE BASE, N.M. -- Senior Airman Karla Lucas, 49th Operations Support Squadron, uses an Electronic Terminal Voice Switch May 19, 2011, from the air traffic control tower. Airman Lucas uses the ETVS to switch between radio channels to establish a safe flight line for aircraft to land or takeoff. Airmen and civilians from the 49th OSS control out to five nautical miles and up to 2.5 thousand feet of airspace. They also manage 21 miles of runways, taxiways and aircraft ramps. (U.S. Air Force photo by Airman 1st Class Joshua Turner/Released)
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