Coast Guard Lt. Mike Grochowski conducts high frequency noise floor measurements with a spectrum analyzer aboard the Coast Guard Cutter Healy near Alaska Aug. 9, 2014. Grochowski and other members from the Coast Guard Research and Development Center, based in New London, Conn., are traveling aboard the Healy to study technologies in the Arctic as part of Arctic Shield 2014. (U.S. Coast Guard photo by Bill Jankowski)
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