One paradox of nuclear deterrence has always been that whatever utility the Bomb provides is lost once the nuclear threshold is crossed, however large or small the boom. There is no bigger blunderbuss than a nuclear weapon atop a long-range missile. Smaller-yield message-senders have been created in the form of tactical nuclear weapons, but any advantageous battlefield use of nuclear weapons against a similarly armed foe requires heroic assumptions. Basic nuclear deterrence is measured by non-use. The derived benefits of “strengthening” deterrence by means of more discriminating or improved methods of delivery have been completely conjectural.