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The 1958 US–UK Mutual Defense Agreement, or UK–US Mutual Defense Agreement,〔 is a bilateral treaty between the United States and the United Kingdom on nuclear weapons cooperation. The treaty's full name is Agreement between the Government of the United States of America and the Government of the United Kingdom of Great Britain and Northern Ireland for Cooperation on the uses of Atomic Energy for Mutual Defense Purposes. It was signed after the UK successfully tested its first hydrogen bomb during Operation Grapple. While the US has nuclear cooperation agreements with other countries, including France and some NATO countries, this agreement is by far the most comprehensive. The treaty is renewed every ten years, most recently extending the treaty to 31 December 2024. ==Details of the agreement== The agreement enables the US and the UK to exchange classified information with the objective of improving each party's "atomic weapon design, development, and fabrication capability". This includes development of defence plans; training personnel in the use and defence against nuclear weapons; evaluation of enemy capabilities; development of nuclear delivery systems; and research, development and design of military reactors. The agreement also provides for the transfer of special nuclear material (e.g., plutonium, highly enriched uranium, tritium), components, and equipment between the two countries, and the transfer of "non-nuclear parts of atomic weapons" to the UK. The agreement also covered the export of one complete US submarine nuclear propulsion plant and its enriched uranium fuel which was installed in the UK's first nuclear-powered submarine, HMS ''Dreadnought''. The UK was able to carry out underground nuclear tests at the US Nevada Test Site, the first taking place on 1 March 1962, following this agreement. There are also confidential intelligence matters covered by the agreement. The UK government has not published these sections "because of the necessity for great confidentiality and because ... it might well assist proliferation". While most of the activity under the treaty is information exchange through joint working groups, as of 2014 there are also two enhanced collaborations jointly developing capabilities: * Enhanced Nuclear Safety – to develop architectures and technologies related to warhead safety * Warhead Electrical System – to develop architectures and technologies for warhead electrical systems This agreement replaced the earlier "Agreement for Cooperation Regarding Atomic Information for Mutual Defense Purposes" of 1955. A separate Polaris Sales Agreement was signed on 6 April 1963. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1958 US–UK Mutual Defence Agreement」の詳細全文を読む スポンサード リンク
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