151027-N-XP344-105 CHARLESTOWN, Mass. (Oct. 27, 2015) Crew members assigned to USS Constitution pull copper sheets away from the hull near the keel of Old Ironsides as part of the restoration work being performed on the ship. Constitution is lined with 3,400 sheets of copper that are replaced every15-20 years. (U.S. Navy photo by Mass Communication Specialist 2nd Class Victoria Kinney/Released)