Staff Sgt. Brian Lecates, 436th Security Forces Squadron, moves quickly down a hallway while responding to an active shooter scenario at Building 520 on Aug. 1, 2014, at Dover Air Force Base, Del. Lecates used a rubber-gun instead of a real weapon during training. (U.S. Air Force photo/Greg L. Davis)
Airman 1st Class Jason Melanson, 436th Medical Group records technician, plays the role of a casualty during an active shooter exercise Aug. 1, 2014, at Dover Air Force Base, Del. Team Dover personnel conducted the exercise to test and evaluate the emergency response capabilities of the base and local community. (U.S. Air Force photo/Greg L. Davis)
Senior Airman Nicole Silva, 3rd Airlift Squadron C-5M loadmaster, plays the role of a casualty during an active shooter exercise Aug. 1, 2014, at Dover Air Force Base, Del. Extensive make-up was applied to participants for added realism. (U.S. Air Force photo/Greg L. Davis)
Peter Bortz, 436th Civil Engineer Squadron, Fire Department, takes a count of casualties and the extent of their injuries in the aftermath an active shooter scenario Aug. 1, 2014, at Dover Air Force Base, Del. Bortz is a firefighter/emergency medical technician responsible for the quick evaluation and the orderly removal of casualties from the scene. (U.S. Air Force photo/Greg L. Davis)
Three members of the Kent County, Delaware, Department of Public Safety, Division of Emergency Medical Services, listen intently during a briefing in a hallway as they respond to a Major Accident Response Exercise with active shooter scenario on Aug. 1, 2014, at Dover Air Force Base, Del. From right to left are: Rich Allen, Scott McMillon, both tactical medics, and Capt. John Tinger, SWAT Medical Team commander. (U.S. Air Force photo/Greg L. Davis)
Staff Sgt. Brian Lecates, 436th Security Forces Squadron, secures a suspect after he was neutralized by a breaching-team during a Major Accident Response Exercise with active shooter scenario Aug. 1, 2014, at Dover Air Force Base, Del. The exercise took place inside Building 520 and involved military police, medical and other emergency services along with their civilian counterparts from the local area. (U.S. Air Force photo/Greg L. Davis)
A label applied to a counter shows that Airman 1st Class Cameron Prescott, a 9th Airlift Squadron C-5M loadmaster, fell where he stood during an active shooter exercise in the finance section of Building 520 on Aug. 1, 2014, at Dover Air Force Base, Del. The scenario involved a disgruntled member that had issues with their military pay. (U.S. Air Force photo/Greg L. Davis)
Paramedics from the 436th Civil Engineer Squadron, Fire Department, rush a casualty out of the area on a stretcher while a simulated fatality remains on the floor during an active shooter scenario Aug. 1, 2014, at Dover Air Force Base, Del. (U.S. Air Force photo/Greg L. Davis)
An expended 9 mm shell sits along the edge of a hallway along with a black magazine from the shooter's gun during an active shooter scenario at Building 520 on Aug. 1, 2014, at Dover Air Force Base, Del. The round is actually a blank used to simulate the actual sound and flash of a real pistol being fired. (U.S. Air Force photo/Greg L. Davis)
Airman 1st Class Brandon Trapp, 436th Security Forces Squadron, leads a military and civilian clearing team through building 520 during an active shooter scenario Aug. 1, 2014, at Dover Air Force Base, Del. Trapp is a law-enforcement specialist and the personnel immediately behind him are tactical medics from the Kent County SWAT Medic Team. (U.S. Air Force photo/Greg L. Davis)