Staff Sgt. Christopher Giles, non-lethal weapons instructor with the 319th Security Forces Squadron, trains a flight how to form a “squad echelon right” April 9, 2013, at Grand Forks Air Force Base, N.D. A squad echelon right is a non-lethal weapons tactic used by law enforcement during riots. (U.S. Air Force photo/Airman 1st Class Xavier Navarro)