Yard on 16 January 1946. Lionfish was recommissioned on 31 January 1951, and headed for the East Coast for training cruises. After participating in NATO exercises and a Mediterranean cruise, she returned to the East Coast and was decommissioned at the Boston Navy Yard on 15 December 1953. In 1960, the submarine was called to duty again, this time serving as a reserve training submarine at Providence, Rhode Island. In 1971, she was stricken from the Navy Register, and in 1973, she was unveiled for permanent display as a memorial at Battleship Cove, where she has evolved into one of the museum’s most popular exhibits and a monument to all submariners. Hiddensee Originally commissioned by the East German Navy as Rudolf Egelhofer, Hiddensee is a built at the Petrovsky Shipyard in 1984, located near the former Soviet (now Russian) city of Leningrad (now St. Petersburg). An example of a Soviet-built missile corvette, Hiddensee was designed to oppose any naval threat to the East German coast, and to fulfill this mission carried long-range Styx anti-ship missiles and an array of defensive weapons designed to ensure her own survival. Following the reunification of Germany, Hiddensee served with the Federal German Navy until her decommissioning in April 1991. Shortly thereafter she was reactivated and transferred to the U.S. Navy. Joined briefly by a crew of 20 former East German sailors, a small civilian U.S. crew conducted extensive testing with the vessel at the U.S. Navy's Solomons, Maryland facility in the Patuxent River. After 50 underway deployments in the Chesapeake Bay and Virginia Capes areas, Navy budget cutbacks severely curtailed operations, but she continued on as a research vessel until April 1996. Hiddensee joined the Battleship Cove fleet in Fall River on June 14, 1997. She is moored on the port side of . PT boats The year 1975 marked the arrival of PT boat PT-796, joined in 1984 by PT-617, forming the only pair of restored PT boats on display in the world. PT-617 is the only remaining Elco PT boat on display similar to that of John F. Kennedy's PT-109. USS Fall River USS Fall River (CA-131) was a heavy cruiser launched 13 August 1944 by New York Shipbuilding Corp. at Camden, New Jersey; sponsored by Mrs. Alexander C. Murray, wife of the mayor of Fall River; and commissioned 1 July 1945, Captain D. S. Crawford in command. On 31 October 1945,