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A U.S. Army UH-60Q Black Hawk medevac helicopter assigned to 1st Battalion, 52nd Aviation Regiment, approaches the landing zone used to evacuate simulated casualties from a homeland defense attack scenario conducted in collaboration with civilian first responders in North Pole, Alaska, May 9, 2007, as part of Alaska Shield/Northern Edge 2007. Alaska Shield/Northern Edge 2007 is a state of Alaska and U.S. Northern Command-sponsored homeland defense and defense support of civil authorities exercise. (U.S. Navy photo by Chief Mass Communications Specialist Greg Bingaman/Released)