U.S. Air Force Senior Airman Cory Littlefield, 35th Communications Squadron, radio frequency transmission systems technician, measures voltage from the batteries to the radio in one of the base's mass notification system poles Dec. 4, 2010 at Misawa Air Base, Japan. The Giant Voice system provides base-wide mass notification and alert warning to more than 13,000 residents and workers. (U.S. Air Force photo/Tech. Sgt. Phillip Butterfield)
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