Staff Sgt. Thomas Linson III, 2nd Civil Engineer Squadron firefighter, trains Senior Airman Jeremy Gobert, 307th Civil Engineer Squadron firefighter, on how to rekey a radio on Barksdale Air Force Base, La., Aug. 1. Rekeying changes the encryption key, which limits the amount of data that goes through the channels. This helps keep radio frequencies secure. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)(RELEASED)