BOSTON - The USS Constitution fires a 17-gun salute with its cannon in front of the Coast Guard base in Boston's North End during its annual turn around, Monday, July 4, 2011. The ship left its mooring at the Charlestown Navy Yard, transited to Castle Island, Mass., where the crew rendered a 21-gun salute at Fort Independence and fired a 17-gun salute at the Coast Guard base in Boston's North End before returning to the navy yard. Coast Guard photo by Petty Officer 3rd Class Connie Terrell.