WASH DOWN Air Force Tech. Sgt. Timothy Cotterall goes through a decontamination procedure after attempting to identify multiple biological contaminants in a simulated lab during a Global Dragon training event in Perry, Ga., March 18, 2015. The training provides a refresher course for airmen, allowing them to identify live chemical, biological, radiological and nuclear agents and materials. Cotterall is assigned to the 137th Air Refueling Wing. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 519854-E-HBY21-345.jpg Photo Gallery