The US Navy has fielded a low-yield, submarine-launched ballistic missile warhead, which is a smart move that is an appropriate response to what adversaries are doing.

The United States must be able to convince our adversaries that Americans have the will and capability to inflict punishment on them in response to an act of aggression such that they would not carry out the act of aggression in the first place, and so the United States won’t have to inflict the punishment it promises.