Petty Officer 2nd Class Mary Doyle, a boatswain's mate at Aids to Navigation Team Philadelphia, explains the unit's missions and area of responsibility Thursday, Sept. 11, 2014, in Philadelphia. ANT Philadelphia services buoys on the Delaware River and supports the coastal buoy tender, Coast Guard Cutter William Tate. U.S. Coast Guard video by Petty Officer 1st Class Nick Ameen
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