Trident is not an independent weapons system  Britain tries to maintain that it has an ‘independent nuclear deterrent’ but this is just a fiction. Britain has not had an independent nuclear deterrent for fifty years. The United Kingdom has used American missiles since the Polaris Sales Agreement of 6 April 1963 first with the United States supplying Polaris missiles and then Trident missiles. [1] The UK does not own its missiles, they are leased, and the UK is completely dependent on the US for the maintenance of the missiles and even for targeting data. [2] The United States certainly appears to consider Britain’s deterrent to be dependent on them; wikileaks revealed that the US handed over the serial numbers of the missiles it transfers to the UK over to Russia to help the Russians verify the number of UK missiles. [3]  [1] Jimmy Carter: "Sale of Trident I Missiles to the United Kingdom Exchange of Letters Between the President and Prime Minister Margaret Thatcher of the United Kingdom. ," July 14, 1980. Online by Gerhard Peters and John T. Woolley, The American Presidency Project.  [2] ‘UK’s Trident system not truly independent’, Select Committee on Defence Written Evidence, 7 March 2006.  [3] ‘Geneva: Agreed statements meeting, 10Geneva135 26 February 2010’, The Telegraph, 4 February 2011.