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8 party attacked so that they can be largely anticipated by an aggressor. Facing no defenses, there can be little doubt that, if ballistic missiles function reliably, they will arrive on target. Finally, predicting the specif@ levels of damage they can inflict on a target is largely a mater pf physics. Their effectiveness does not depend on the skfll, courage or training of men in the loop. It depends on the echtological reliability of the system which dan be tested and measured in peacetime. (U) If such systems were eliminated, the uncertäinty in the mind of an aggressor must incruase because of thents of their unique characteristics. Provided that we take steps to ensure that other forms of attack are not permitted to rebuild that certainty over time, the result can be a significant net gain in terms of the quality of deterrence and, in turn, in our security and that of our allies. In considering the requirements for maintaining deterrence in such a future world, a high premium should be placed on identifying, determining the feasibility of, and taking such steps. (U) Measuring the Impact on terrence. In mes aring our ability to deter in an alternati ture, we must ake into account the elimination of the ntri ution of 1 illistic missiles and the corresponding élativ increase the egree of our uncertainty in the effectiveness of our retaliatory strike, should deter Ince fail. Buthar the same time, we must also properly reflect in jur measurement the contribution that this same inherent untert linty makes in letGring an aggressor. We should also consid r the even more fi adarental contribution that is made to our should we Fice an aggressor who is not rational or finds hin Self placed trational situation by events that have beyond his but who is armed only with systems agannt which we can build a reasonable defense should we choose to do so. We must also weigh the real and immediate benefits of removing an immense, existing threat to the United States that is literally only thirty minutes away. Nor can we forget that, unlike Soviet stated policy, US strategic and nuclear forces are intended to make an explicitly identified contribution to the deterrence of conventional attack on our Allies and our forces deployed in support of our Allies. (U) In accomplishing this surement, to the tent practical, we should attempt to app bach the problem om the point of view of a net assessment bnsiderationsé Invo ved. Our present analytic tools will falleshort of Iving all the questions such an alternat We presents There pre, until new methods adapted e challenges por unities of this alternative futureva e fi tly developed, we ill have to depend heavily on the exper; enci expertise, risou cefulness, creativity, and judgment bf our profess onal military and defense community. I believi that this, too, pl ay si into a significant aspect of our streng n. (U) TOP SECRET TOP SECRET