BOSTON (AP) — The newly refurbished USS Constitution is taking its first spin in three years. Friday's joyride from Charlestown Navy Yard in Boston to Fort Independence on Castle Island will celebrate the U.S. Navy's 242nd birthday and the 220th anniversary of the iconic vessel's maiden voyage. The world's oldest commissioned warship will fire a 21-gun salute in the waters off the fort, and its cannons will boom another 17 times as it passes the U.S.