U.S. Air Force Senior Airman Sandra Askew, assigned to the 633rd Surgical Operations Squadron's women's health clinic, removes an airman's boot during a simulated chemical attack at Joint Base Langley-Eustis, Va., Dec. 12, 2012. Participants in the combined unit exercise assisted each other through simulated chemical decontamination process stations. (U.S. Air Force photo by Airman Kimberly Nagle/Released)