In 2016, the UK accidentally fired a Trident missile at the US mainland: http://www.dw.com/en/uk-government-covered-up-disastrous-failure-in-nuclear-missile-tes

In 2016, the UK accidentally fired a Trident missile at the US mainland: http://www.dw.com/en/uk-government-covered-up-disastrous-failure-in-nuclear-missile-test-report/a-37230406 http://www.dw.com/en/uk-government-covered-up-disastrous-fai... This one did not carry a warhead. Others do...