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

BOSTON (Jul. 04, 2010) USS Constitution fires a 21-gun salute toward Fort Independence on Castle Island during the ship's July 4th underway. The underway is one of the last major events of Boston Navy Week, June 30-July 5. Boston Navy Week is one of 20 Navy Weeks planned across America for 2010. Navy Weeks show Americans the investment they have made in their Navy and increase awareness in cities that do not have a significant Navy presence. (U.S. Navy photo by Seaman Apprentice Shannon S. Heavin) File# 100704-N-5647H-389