180704-N-SM577-0304 BOSTON (July 4, 2018) The Massachusetts National Guard 101st Field Artillery Unit returns USS Constitution’s 21-gun salute during ‘Old Ironsides' underway commemoration of Independence Day. Constitution hosted members of the public in commemoration of the 242nd Anniversary of the adoption of the Declaration of Independence by the Second Continental Congress. (U.S. Navy photo by Mass Communication Specialist 3rd Class Casey Scoular/Released)