U.S. Air Force Master Sgt. Steven Ostrander, Air Combat Command security forces programs and requirements manager, reacts to a sudden heat wave produced by the Active Denial System at Fort Eustis, Va., Sept. 13, 2013. The ADS system allows personnel the capability to project a man-sized beam of millimeter waves at a range of up to 1,000 meters. (U.S. Air Force photo by Staff Sgt. Wesley Farnsworth/Released)