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.