两国在二战后都制定了某种防御突袭的政策，为了达到威慑对方的目的，双方还投资了数万亿美元来制造大量永备性，机动性和隐蔽性的核武设施。
After the war, each adopted a “never be surprised again” policy, and so went on to invest trillions of dollars in a multitude of hardened, mobile, and concealed nuclear weapons to deter the other.