2005208-N-ES994-0035 BOSTON (May 8, 2020) Cmdr. Pat Hart conducts a Facebook live tour aboard USS Constitution. USS Constitution, is the world's oldest commissioned warship afloat, and played a crucial role in the Barbary Wars and the War of 1812, actively defending sea lanes from 1797 to 1855. (U.S. Navy photo by Chief Mass Communication Specialist Elliott Fabrizio/Released)