Going through the gate of a defender's mind
Staff Sgt. Jon-Paul Horning, 86th Security Forces Squadron creek defender course trainee, advances through a smoke grenade during building clearance training, Oct. 17, 2013, Baumholder, Germany. Horning was part of a 98-student class undergoing training to prepare them for deployed conditions around the world. (U.S. Air Force photo/Airman 1st Class Jordan Castelan)