U.S. Air Force Tech. Sgt. Mark Chavez, 1st Operations Support Squadron air traffic controller, confirms weather changes in the control tower at Langley Air Force, Va., Nov. 4, 2015. Air traffic controls Airmen approve flight plans, ensure takeoff and landing safety and direct air traffic, for all aircraft working with the airfield. (U.S. Air Force photos by Airman 1st Class Derek Seifert/ Released)