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The Los Angeles-class submarine USS Annapolis (SSN 760) rests in the Arctic Ocean March 21, 2009, after surfacing through three feet of ice during Ice Exercise 2009. The two-week training exercise, which is used to test submarine operability and war-fighting capability in Arctic conditions, involves two Los Angeles-class submarines, USS Helena (SSN 725) and USS Annapolis (SSN 760), the University of Washington and personnel from the Navy Arctic Submarine Laboratory. (DoD photo by Mass Communication Specialist 1st Class Tiffini M. Jones, U.S. Navy/Released)

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