Tech. Sgt. Gregory Nickels, 23d Security Forces Squadron NCO in charge of the information fusion cell, surveys the scene over a brick wall during an active shooter exercise, Dec. 8, 2016, at Moody Air Force Base, Ga. Airmen and civilian personnel conducted lockdown procedures for approximately 1 hour and 30 minutes. (U.S. Air Force photo by Airman 1st Class Daniel Snider)