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Royal Air Force Sgt. Steve Barnes, 83rd Expeditionary Air Group mechanical transport officer, dons his respirator in response to a simulated attack during a base defense exercise, Nov. 3, 2009 in Southwest Asia. Personnel assigned to the 379th Air Expeditionary Wing and base tenant units participate in exercises regularly to train on a variety of potential real-world scenarios. (U.S. Air Force Photo/Staff Sgt. Robert Barney/Released)
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