Senior Airman Otis Osborn, 28th Communications Squadron radio frequency transmissions technician, connects a power supply to a portable radio during scheduled maintenance in the 28th CS Radio Maintenance shop on Ellsworth Air Force Base, S.D., Feb. 7, 2013. Connecting the power supply helps technicians pinpoint malfunctions during periodic maintenance. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)