Deployment of new US nuclear warhead on submarine a dangerous step, critics say

First submarine to go on patrol armed with the W76-2 warhead makes a nuclear launch more likely, arm control advocates warn

Julian Borger in Washington
Wed 29 Jan 2020 17.53 GMT
Last modified on Wed 29 Jan 2020 18.24 GMT

The US has deployed its first low-yield Trident nuclear warhead on a submarine that is currently patrolling the Atlantic Ocean, it has been reported, in what arms control advocates warn is a dangerous step towards making a nuclear launch more likely.

According to the Federation of American Scientists, the USS Tennessee – which left port in Georgia at the end of last year – is the first submarine to go on patrol armed with the W76-2 warhead, commissioned by Donald Trump two years ago.

It has an explosive yield of five kilotons, a third of the power of the “Little Boy” bomb dropped on Hiroshima and considerably lower than the 90- and 455-kiloton warheads on other US submarine-launched ballistic missiles.

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Advocates of W76-2 argued that the US had no effective deterrent against Russian tactical weapons because Moscow assumed Washington would not risk using the overwhelming power of its intercontinental ballistic missiles in response, for fear of escalating from a regional conflict to a civilian-destroying war.

Critics of the warhead say it accelerates a drift towards thinking of nuclear weapons as a means to fight and win wars, rather than as purely a deterrent of last resort. And the fielding of a tactical nuclear weapon, they warn, gives US political and military leaders a dangerous new option in confronting adversaries other than Russia.

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