Airmen 1st Class Mark Walker Jr., left, and James Little III, both 47th Security Forces Squadron patrolmen, guard a door during an active shooter scenario at Laughlin Air Force Base, Texas, Aug. 14, 2013. Several 47th SFS members helped during the exercise to resolve the active shooter scenario as efficiently and expeditiously as possible. (U.S. Air Force photo/Senior Airman John D. Partlow)