The effectiveness of merchant ships in ocean transport-and of surface naval vessels to protect them or to blockade them as the circumstances require- was the foundation on which Great Britain built her empire, on which the United States bases the credibility of her international commitments and by which the U.S.S.R. hopes to expand her role in Africa and Asia. That foundation continues to erode under an irresistible tide of technology, the key expressions of which are the submarine and the missile.

To many this is an unbelievable assertion, doubly so because its consequences for international relations as

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