Associated Press
The USS Constitution fires one of her guns in Boston Harbor as a crowd looks on from the shore in Boston, Sunday, Aug. 19, 2012. The USS Constitution, the U.S. Navy's oldest commissioned war ship, sailed under her own power Sunday for the first time since 1997. The event was held to commemorate the 200th anniversary of the ship's victory over HMS Guerriere in the War of 1812. (AP Photo/Steven Senne)

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