Fireman Apprentice John Perkins saws an 18-foot metal pipe used as piling for aids to navigation to test the entry point of a vibratory hammer pier side at the Coast Guard Yard in Curtis Bay, Md., Tuesday, Sept. 29, 2015. The crew of the Coast Guard Cutter Sledge received the vibratory hammer and tested before getting underway. (U.S. Coast Guard photo by Petty Officer 2nd Class David Marin)
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