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Successor to the UK Trident system
The Successor programme is a British programme to replace the ''Vanguard''-class of ballistic missile submarines, which began to enter service in 1992 with a 25 year intended service life. These submarines currently carry the Trident D5 ballistic missiles, which are now the sole delivery vehicle for the UK's nuclear weapons. The submarine is currently referred to as Successor. Replacement of the ''Vanguard''-class submarines as they reach the end of their service life is necessary if the UK is to retain a continuous at-sea deterrent (CASD). The programme has generated political controversy as some oppose the retention of CASD or of any nuclear weapons by the United Kingdom on moral, legal, or financial grounds.
The term "Trident" is popularly used to refer to Britain's entire current system of nuclear weapons, including the ''Vanguard''-class submarines, Trident missiles, and warheads, without distinction, and "replacement of Trident" to refer to the Successor programme. However, the Successor programme does not concern the replacement of the Trident missiles themselves, which are designed, manufactured, and maintained in the United States. No project for the replacement of the Trident missile currently exists in either country.
In May 2011 the previous Government approved the initial assessment phase for the new submarines, and authorised the purchase of long lead-time items including steel for the hulls. In May 2015, the Conservative Party won the UK General Election on a manifesto which included a commitment to maintaining a continuous at-sea deterrent with four Successor submarines. The final decision to commit to the Successor programme is expected in 2016. If the programme goes ahead, construction of the submarines will start in late 2016 at the Barrow shipyard operated by BAE Systems. The first submarine is intended to enter service in 2028.
==Background==
(詳細はウィキペディア（Wikipedia）』
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