SHAW AFB, S.C. -- Staff Sgt. Susanne Smith, 20th Aerospace Medical Squadron bioenvironmental section, helps Tech. Sgt. Jody Brown, also of the 20th AMDS, into a Level A suit during the Air Combat Command Chemical, Biological, Radiological and Nuclear Challenge, July 15. Level A suits are fully encapsulating personal protective equipment complete with a self-contained breathing apparatus. In real world incidents, Level A suits are donned when emergency responders deal with an unknown variable. (U.S. Air Force photo/Senior Airman Kathrine McDowell)