4/8/2013 - Staff Sgt. Daniel Montgomery, 100th Security Forces Squadron response force leader from Frankfort, Ohio, sweeps the area during an exercise March 28, 2013, at RAF Mildenhall, England. As part of an emergency lockdown exercise, an armed assailant was on RAF Mildenhall in the vicinity of building 809. Service members are trained how to react and deal with these kinds of scenarios. (U.S. Air Force photo by Gina Randall/Released)

4/8/2013 - Military Working Dog Vvonya, a 100th Security Forces Squadron dog, and her handler inspect rooms during an exercise March 28, 2013, at RAF Mildenhall, England. As part of the emergency lockdown exercise, an armed assailant was on RAF Mildenhall in the vicinity of building 809. Service members are trained how to react and deal with these kind of scenarios. (U.S. Air Force photo by Gina Randall/Released)

4/8/2013 - Firefighters from the 100th Civil Engineer Squadron Fire Department move a simulated patient to an ambulance for medical care during an exercise March 28, 2013, at RAF Mildenhall, England. The firefighters utilized a two-man carry to transport a simulated-injured Airman to the casualty collection point where the triage officer, also a firefighter, could determine injury extent and patient transport priority. They also provided additional medical care to injured personnel at the casualty collection point. (U.S. Air Force photo by Gina Randall/Released)

4/8/2013 - Firefighters from the 100th Civil Engineer Squadron Fire Department prepare to move a simulated patient to an ambulance during an exercise March 28, 2013, at RAF Mildenhall, England. The 100th CES firefighters gave the patient oxygen and they immobilized and packaged him prior to placing him on the ambulance and transporting him to an emergency medical facility. (U.S. Air Force photo by Gina Randall/Released)