CBRN Challenge
Senior Airman Stephanie Lewis and Senior Airman Patrick Bellamy, Nellis AFB, Nev., members of the Air Combat Command Chemical, Biological, Radiological and Nuclear Challenge team, check a simulated vehicle bomb for possible radiological and chemical contamination during the 2007 Air Force CBRN Challenge held at Brooks City-Base, TX. (U.S. Air Force photo/Steve Thurow)