U.S. Air Force Master Sgt. Scott Knowles, left, instructs Staff Sgt. Crystal Walker on the proper procedure for clearing the M4 rifle while processing through a Contamination Control Area (CCA) during the Team Joint STARS Operational Readiness Exercise, Robins Air Force Base, Ga., July 12, 2012. During the exercise, Airmen operating the CCA were graded on how quickly and effectively they were able to decontaminate personnel who had been contaminated with a simulated chemical agent. ( National Guard photo by Master Sgt. Roger Parsons/Released)
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