USS Constitution fires a 21-gun salute toward Fort Independence on Castle Island during the ship's July 4th underway as part of Boston Harborfest.

BOSTON (Jul. 04, 2011) USS Constitution fires a 21-gun salute toward Fort Independence on Castle Island during the ship's July 4th underway as part of Boston Harborfest. The six-day Fourth of July festival showcases Boston's Colonial and maritime heritage to honor and remember the past, celebrate the present, and educate the future with reenactments, concerts and historical tours. (U.S. Navy photo by Mass Communication Specialist Seaman Shannon Heavin) File# 110704-N-AU127-119