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USS Lyndon B. Johnson
USS ''Lyndon B. Johnson'' (DDG-1002) is to be the third and final ship of the . The contract to build her was awarded to Bath Iron Works located in Bath, Maine, on 15 September 2011. The award, along with funds for the construction of , was worth US$1.826 billion. On 16 April 2012, Secretary of the Navy Ray Mabus announced the ship would be named ''Lyndon B. Johnson'' in honor of Lyndon B. Johnson, who served as the 36th President of the United States from 1963 to 1969. DDG-1002 is the 34th ship named by the Navy after a U.S. president.
''Lyndon B. Johnson'' is a ''Zumwalt''-class destroyer, 32 units of which were originally planned, the U.S. Navy eventually reduced this number to three units. Designed as multi-mission ships with an emphasis on land attack and littoral warfare, the class features the tumblehome hull form, reminiscent of ironclad warships. In January 2013 the Navy solicited bids for a steel deckhouse as an option for ''Lyndon B. Johnson'' instead of the composite structures of the other ships in the class. This change was made in response to cost overruns for the composite structure, but due to the tight weight margins in the class, required weight savings in other parts of the ship.
In February 2015, the Navy revealed they had begun engineering studies to include an electromagnetic railgun on ''Lyndon B. Johnson''. The ''Zumwalt'' class has been identified as more suited to use emerging technologies, like railguns, due to its superior electricity generation capability over previous destroyers and cruisers at 80 megawatts; ''Lyndon B. Johnson'' specifically is being studied because it is the latest of the class, while the previous two ships would be less likely to initially field the capability due to the testing schedule. The railgun would likely replace one of the two Advanced Gun Systems.
In September 2015, it was reported that Defense Department officials were considering terminating funding for ''Lyndon B. Johnson'' prior to its completion. Although being considered as a cost-saving measure, cancelling the third ''Zumwalt'' ship at this stage may not be possible, as the ship is already largely built and paid for. Depending on which fiscal year funds would be cut, savings could range from $979 million (before FY 2016), to $458 million (before FY 2017), to none and ending up actually costing more compared to the marginal cost of finishing construction after paying program shutdown costs and contract termination penalties. Savings on operations and maintenance costs compared to the smaller and less complex s would not be enough to buy one in its place, so the Navy would be short one major surface combatant.〔(Cuts To Zumwalt Destroyer Won’t Save Much ) - Breakingdefense.com, 21 September 2015〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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