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U.S. Air Force pararescuemen, rangers with the National Park Service in Arizona and local fire and rescue crews participate in a mass casualty exercise at the Grand Canyon in Arizona April 13, 2013, during exercise Angel Thunder 2013.
Angel Thunder is a joint service, interagency and multinational combat search and rescue exercise designed to provide training for personnel recovery assets in a variety of scenarios to simulate deployment conditions and contingencies. (DoD photo by Staff Sgt. Tim Chacon, U.S. Air Force/Released). Original public domain image from Flickr
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