U.S. Air Force Senior Airman Sandra Askew, 633rd Surgical Squadron women’s health clinic, removes an Airman’s boot during a simulated chemical attack at Langley Air Force Base, Va., Dec. 12, 2012. During this phase I command unit exercise, players were instructed to break into pairs and assist each other through the simulated-chemical decontamination process stations. (U.S. Air Force photo by Airman Kimberly Nagle/Released)