USS Constitution fires a 21-gun salute toward Fort Independence on Castle Island during an underway to celebrate the 213th launching day anniversary of the ship.

BOSTON (Oct. 21, 2010) USS Constitution fires a 21-gun salute toward Fort Independence on Castle Island during an underway to celebrate the 213th launching day anniversary of the ship. Constitution is the world's oldest commissioned warship afloat. (U.S. Navy photo by Mass Communication Specialist 3rd Class Kathryn E. Macdonald) File# 101021-N-7642M-164