The Coast Guard Cutter Polar Star transits near the beginning of the ice edge in the Chukchi Sea north of Wainwright, Alaska, Tuesday, July 16, 2013. The heavy icebreaker's crew are undergoing ice trails following the conclusion of a major overhaul in 2012 to return the ship to service. (U.S. Coast Guard photo by Petty Officer 1st Class Sara Mooers)
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