British Submarines to Receive Upgraded US Nuclear Warhead

The Royal Navy plans to “integrate” the US W76-1/Mk4A warhead onto British SSBNs.

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By Hans M. Kristensen

Sea-launched ballistic missiles on British ballistic missile submarines will be armed with the upgraded W76-1 nuclear warhead currently in production in the United States, according to a report from Sandia National Laboratories.

According to the Labs Accomplishments from March 2011, “the first W76-1 United Kingdom trials test was performed at WETL [Weapon Evaluation Test Laboratory], providing qualification data critical to the UK implementation of the W76-1.”

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