The World War II destroyer U.S.S. _Cassin Young_ (DD-793) reflects a very different kind of sea power than does _Constitution_. Yet both warships, constructed 150 years apart, served much the same purpose. Like frigates, destroyers (known as the workhorses of the modern navy) are smaller and less powerful than the heaviest warships, but they are fast and remarkably versatile. Boasting five 5-inch guns and made of steel, _Cassin Young_ was built on the West Coast in 1943 and took part in major Pacific engagements, including the Saipan landing and the Battle of Leyte Gulf, where its crew rescued over 100 sailors from the attack on U.S.S. _Princeton_. [Illustration: Free tours let visitors see where the “tin can sailors” lived during their long months at sea.] [Illustration: Aboard _Cassin Young_, “Rosie the Riveter” programs introduce visitors to the work and lives of the women who wielded rivet guns and welding rods during World War II.] [Illustration: _Cassin Young’s_ bow offers views of the historic yard and harbor.] The Exhibits Today, exhibits and educational activities help bring alive the navy yard and Boston’s maritime history. At the USS Constitution Museum, located in the historic Dry Dock 1 Pumphouse and adjacent buildings, hands-on activities help visitors to appreciate the skills of a 19th-century seaman and get a sense of his life aboard a sailing warship. Load and fire a replica cannon, try out a sailor’s sleeping quarters, take a turn at the great wheel of a square-rigger, or command U.S.S. _Constitution_ in battle on a computer screen. The museum houses the frigate’s logs, weapons, documents, charts, journals, decorative arts, and other items illustrating the epic role of “Old Ironsides” in U.S. history. Skilled craftsmen demonstrate ship model building, while films and special programs provide greater insight into the ship’s story. A museum store offers other items relating to _Constitution’s_ history and to the nation’s maritime heritage. [Illustration: USS Constitution Museum] [Illustration: USS Constitution Museum] [Illustration: A permanent exhibit, “Serving the Fleet,” which focuses on the history of the navy yard, is open to the public on a seasonal basis in the navy yard’s Paint Shop (Building 125).] Index _Numbers in italics refer to photographs, illustrations, or maps._ A “ABCD ships” 50, 54 Aircraft carrier 51, 60, _66_, 72 B Bainbridge, William 11, _12_, 13, 15, 17 Barbary States 9, 14, 15-16 Battleship 11, 47, 49, 51, 57 Brig-of-war _14_ British Navy 11, 13, 15, 16 Burroughs, George W. _46_