Senior Airman Taylor Neill, 60th Communications Squadron ground radar maintenance, briefs U.S. Air Force Academy Cadets about a Digital Airport Surveillance Radar tower at Travis Air Force Base, Calif., July 3, 2012, as part of Operation Air Force. The radar is capable of controlling aircraft up to 240 nautical miles. (U.S. Air Force photo/Airman 1st Class Nicole Leidholm)