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For the longer term deterrence of the Chinese, “we emphasize the need to strengthen extended nuclear deterrence with the deployment of additional and more diverse capabilities, including SLCM/N,” he said, referring to the submarine-launched nuclear cruise missile.

In an email, a senior Pentagon official cited “the deterrence contribution of the W76-2,” as well as cost constraints, to explain the cancellation of the SLCM.

Unlike with the low-yield weapon, which the Pentagon plans to develop quickly, the SLCM’s reintroduction could be many years away.