Guardians of Ellsworth's airspace
Senior Airman Andrew Ahrendt, 28th Operations Support Squadron air traffic controller, makes contact with ground crews at Ellsworth Air Force Base, S.D., Sept. 22, 2014. Controllers work with many base agencies including ground crews, weather, the fire department and airfield management to ensure that they are fully aware of all possible flight complications and are able to relay important information to the aircrew. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle/ Released)