U.S. Air Force Senior Airmen Quatari Moodie and Kip Vaughan, 633rd Security Forces Squadron response force leaders, and Staff Sgt. Ervin Faison III, 633rd SFS base defense operations controller, approach a building during an exercise at Langley Air Force Base, Va., May 5, 2015. The exercise demonstrated what potential advantages increased patrol manning would provide in an emergency situation, such as an active shooter on base. (U.S. Air Force photo illustration by Airman 1st Class Devin S. Michaels/Released)