Dion Harris, 28th Security Force Squadron lead instructor, gives a safety brief to Airmen participating in a shoot house competition as part of Police Week at Ellsworth Air Force Base, S.D., May 14, 2013. The competition not only taught Airmen new tactics, but also touched on the psychology and characteristics of active shooters and lessons learned from previous training events. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)