A Reserve Officers' Training Corps member wears a bite suit during a K-9 demonstration held April 17, 2015, at Scott Air Force Base, Ill. The bite suit helps protect handlers and trainers while training the dogs on controlled aggression. Controlled aggression or "biting the bad guy" has a handler use the K-9 as intimidation, and if the "suspect" runs at the handler, the K-9 is released in order to stop them. (U.S. Air Force photo/ Senior Airman Tristin English)