U.S. Service members work together to properly remove personal protective equipment during a two-week Hazardous Material Awareness and Operations Training Course at Langley Air Force Base, Va., Aug. 13, 2014. Students were taught different techniques for dealing with hazardous substances, including identification, what type of personal protective equipment is needed for specific circumstances and the order of controlling a spill. (U.S. Air Force photo by Senior Airman Connor Estes/Released)