U.S. Army Brig. Gen. Cedric Wins, U.S. Army Training and Doctrine Command director of requirements and integration, reacts to a sudden heat wave produced by the Active Denial System at Fort Eustis, Va., Sept. 13, 2013. The ADS system penetrates the first one-sixtyfourth layer of the skin, which is where the individual’s nerve receptors reside. (U.S. Air Force photo by Staff Sgt. Wesley Farnsworth/Released)