Airman 1st Class Andrew Ahrendt, 28th Operations Support Squadron air traffic controller apprentice, monitors air traffic for North and South Dakota at the Radar Approach Control building on Ellsworth Air Force Base, S.D., Nov. 15, 2011. RAPCON coordinates and provides safe flight paths to aircraft to ensure there are no obstructions to cause collisions. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)