Tech. Sgt. Robert Chrisman, 644th Combat Communications Squadron radio frequency transmissions crew chief, moves a modulator in order to establish communication to the communications focal point tent 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)