171020-G-SI450-1001 BOSTON (Oct. 20, 2017) A U.S. Coast Guard Station Boston law enforcement team provides security for the USS Constitution, Friday, Oct. 20, 2017 as it sails in Boston Harbor to commemorate the Navy's 242nd birthday, officially observed on Oct. 13th. On Oct. 21, 1797, 220 years ago, USS Constitution was launched into the Boston Harbor and commissioned as an active duty warship in the United States Navy. Constitution is the oldest commissioned warship afloat in the world. (U.S. Coast Guard photo by Petty Officer 3rd Class Andrew Barresi/Released)