Main Mast Sailors climb the main mast of the USS Constitution to install a topsail 175 feet above the deck, in Boston, Aug. 13, 2018. Navy photo by Petty Officer 1st Class Joshua Hammond SHARE IMAGE: Download Image: Full Size (0.95 MB) Photo By: Petty Officer 1st Class Joshua Hammond VIRIN: 180813-N-NZ935-0082C.JPG Photo Gallery