Tech. Sgt. Michael Foster aides Airman 1st Class Samuel Mericle, members of the Air Force District of Washington CBRNE response force, with putting on his utility vest before responding to a chemical attack during the training scenario at the Center for National Response in Gallagher, W. Va. April 1. The utility vest is used to hold a powered air purifying respirator that filters air that might contain toxic fumes. (U.S. Air Force photo/ Senior Airman Renae Kleckner)