U.S. Air Force Staff Sgt. Gene McLaurin, 36th Security Forces Squadron, searches for additional threats after an active shooter was neutralized during an emergency management exercise May 11, 2017, at Andersen Air Force Base, Guam. When known active shooters are no longer a threat, SFS Airmen clear the building to ensure the area is safe. (U.S. Air Force photo by Airman 1st Class Jacob Skovo)