At CBRN Challenge 2011, 50 warriors representing ten major commands participated in several emergency response scenarios that focused on homeland defense and expeditionary hazardous material and chemical, biological, radiological, and nuclear threat objectives. The training event, which took place July 18 to 22, 2011, was held at the Center for National Response in Gallagher, W.Va. (U.S. Air Force photo/Lisa Cymmer)