Airman 1st Class James Williamson, 81st Medical Group, checks the vital signs of Daniel Fish, Keesler firefighter, before Fish gets into a protective level-A suit for entry into the contamination zone during a chemical, biological, radiological, nuclear and high-yield explosive exercise scenario, Feb. 20, 2014, near Wolfe Hall, Keesler Air Force Base, Miss. The exercise scenario began with a group of Airmen moving old boxes from a storage room where a box containing a bag of powder dropped, causing it to get onto several of the Airmen. Immediately, the Airmen simulated eye irritations, runny noses, difficulty breathing and burning sensations on their hands and faces from exposure to the chemical. (U.S. Air Force photo by Kemberly Groue/Released)