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Trident D5 as an Anglo-American program

Britain and the United States pool Trident D5 missiles and testing data, so a British launch contributes to a shared record.

Notes

Trident D5 is a joint Anglo-American programme under primary US leadership. Britain and the United States pool the missiles and testing data. A New York Times headline framing the event as a UK Trident failure therefore gives an incomplete picture of responsibility for the missile. Assessing a British launch calls for the combined programme's test record.