Staff Sgt. Shaun O'Dell (left) and Airman 1st Class Brandon Ruebsamen use a Drager Civil Defense Simultest Kit to perform sampling for a simulated suspected chemical warfare agent during a major accident response exercise March 16. The training exercise tested the 37th Training Wing and the 59th Medical Wing on their ability to respond to a major incident. Sergeant O'Dell and Airman Ruebsamen are both with the 37th Aerospace Medicine Squadron, Bioenvironmental Engineering. (USAF photo by Robbin Cresswell)