Tugs and U.S. Coast Guard boats escort the USS Constitution to Castle Hill Island. Tugs and U.S. Coast Guard boats escort the USS Constitution to Castle Hill Island in South Boston, Mass., in preparation for a 21-gun salute on June 11, 2005. The wooden hulled, three-masted frigate "Old Ironsides" is the oldest commissioned ship in the U.S. Navy and the world's oldest commissioned warship afloat. SHARE: Download: Full Size (0.11 MB) Credit: VIRIN: 768371-R-PBF66-348.jpg Photo Gallery