Senior Airman Roger Pedraza, 28th Medical Operations Squadron bioenvironmental technician, assists Airman 1st Class Ronald Reynolds, 28th Civil Engineer Squadron emergency management technician, with his respiratory mask during an Integrated Base Emergency Response Capabilities Training at Ellsworth Air Force Base, S.D., May 22, 2014. The mask and Level-A suit protect emergency responders from hazardous materials and contaminated environments. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)