The Polaris Sales Agreement was an agreement between the United States and the United Kingdom which began the UK Polaris programme. The agreement formally arranged for the Polaris missile system to be provided to the UK to maintain its independent nuclear deterrent. The arrangement had been set up in principle as a result of the Nassau Agreement. The agreement was amended in 1982 to provide the Trident missile system to the UK.
The United Kingdom had been planning to buy the air-launched Skybolt missile but the USA decided to cancel the Skybolt program in 1962 as they no longer needed the missile. The British bought the Polaris submarine-launched ballistic missile instead.
The Nassau Agreement was signed on December 18, 1962 resulting in the signing of the Polaris Sales Agreement on April 6, 1963. The United States would supply the United Kingdom with Polaris missiles, launch tubes, and the fire control system. The UK would make the warheads and submarines. In return, the U.S. was given certain assurances by the United Kingdom regarding the use of the missile, however the U.S. does not have any veto on the use of British nuclear weapons. The British Polaris submarines were the Resolution-class ballistic missile submarines, the first of which entered service in 1968. The Polaris system underwent a British-designed life extension programme called Chevaline that reduced the number of warheads and added defensive measures.
Read more about Polaris Sales Agreement: Trident
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