Senior Airman Doug Rish, 779th Aerospace Medical Squadron bioenvironmental engineer, takes photos of simulated radioactive materials and hazardous chemicals during a during a hazardous material exercise Feb. 1, 2010, at Joint Base Andrews, Md. The exercise helped Airmen stay proficient in HAZMAT procedures and decontamination. (U.S. Air Force photo by Airman 1st Class Perry Aston)