Tech. Sgt. Carrell Goff (center), 374th Security Forces Squadron military working dog handler, provides guidance on how to secure the outside of a facility to Senior Airman James Butts (left) and Airman Bryce Eddington (right), both 374th SFS patrolmen, during an active shooter scenario at Yokota Air Base, Japan, Nov. 7. Yokota is participating in a week-long exercise to maintain operational readiness capabilities. (U.S. Air Force photo/Osakabe Yasuo)