Airman 1st Class Ricky Schutter, 28th Civil Engineer Squadron emergency management technician, tests the air for chemicals with a multi-ray detector during a training exercise at Ellsworth Air Force Base, S.D., May 23, 2013. The simulation tested the ability of bioenvironmental engineering, emergency management and ambulance services Airmen to respond to a potentially hazardous liquid spill on base. (U.S. Air Force photo by Airman 1st Class Ashley J. Thum/Released)