1 Mk 11 missile launcher (DDG2-14) or Mk 13 single arm missile launcher (DDG-15-24) for RIM-24 Tartar SAM system, or later the RIM-66 Standard (SM-1) and Harpoon antiship missile.AN/SQS-23 Sonar and the hull mounted SQQ-23 Pair Sonar for DDG-2 through 19.2 × General Electric steam turbines providing 70,000 shp (52 MW) 2 shafts.The debate about retention of the battleships became completely academic in 2011 when the last battleship owned by the Navy, USS Iowa, was donated to a non-profit group to be used as a museum ship. The Iowa-class battleships and the Arleigh Burke- and Zumwalt-class destroyers all entered the debate as options put forward for naval gunfire support, while others advocated the use of specifically designed close air support planes and newer missile systems that can loiter in an area as a replacement for naval gunfire. Many participants favored the continuation of the Zumwalt class or the reinstatement of the Iowa-class battleships to the NVR. Each side presented different arguments on the best approach to the problem. The debate played out across a wide spectrum of media, including newspapers, magazines, web blogs, and congressional research arms including the Government Accountability Office. Congress required the Navy to retain at least two of the four remaining battleships on the Naval Vessel Register (NVR) instead of disposing of them. Many still viewed the battleships as essential for gunfire support, and questioned the Navy's decision. The Navy decommissioned Missouri after determining that her fire support function could be replaced by ship and submarine-launched missiles and aircraft-launched precision guided munitions. The debate at large traced its roots back to the end of World War II, but this round of the debate began in 1992 with the decommissioning of the last active battleship, USS Missouri (BB-63), and ended when the last of these ships was finally completely retired in 2011. The battleship USS New Jersey fires at positions near Beirut on 9 January 1984 during the Lebanese Civil War. Debate over the effectiveness of naval gunfire support
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