A U.S. Army CH-47F Chinook helicopter operated by the 1st Battalion, 52nd Aviation Regiment is silhouetted in the sunlight near the Kahiltna Glacier base camp in Denali National Park, Ala., April 26, 2013. The camp supported mountaineers attempting to climb nearby Mount McKinley. (DoD photo by John Pennell, U.S. Army/Released)
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