Tech. Sgt. Robert Chrisman, 644th Combat Communications Squadron radio frequency transmissions crew chief, moves the modulator while Staff Sgt. David Foster, 644 CBCS RF transmissions supervisor, coordinates with the communications focal point in order to establish a connection with headquarters during Exercise Dragon Thunder at Andersen Air Force Base, Guam, April 19, 2012. Satellite transmission is the main source of communication and information in a deployed environment. (U.S. Air Force photo by Airman 1st Class Marianique Santos)
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