Airmen from the 4th Civil Engineer Squadron emergency management flight and 4th Aerospace Medicine Squadron bioenvironmental flight scout the perimeter of a building during an integrated base emergency response capabilities training exercise, June 24, 2015, at Seymour Johnson Air Force Base, North Carolina. The perimeter was scouted before entry to ensure no simulated hazardous substances were in the area. (U.S. Air Force photo/Senior Airman John Nieves Camacho)