190226-N-SM577-0027 BOSTON (Feb. 26, 2019) Margherita Desy, a historian at Naval History & Heritage Command, Detachment Boston, teaches crew members assigned to USS Constitution about "Old Ironsides" pumping system as part of weekly museum training. USS Constitution Museum and Naval History and Heritage Command are conducting a twelve-week training about Constitution's history for the ship's crew this year. (U.S. Navy photo by Mass Communication Specialist 3rd Class Casey Scoular/Released)