"Meanwhile, in the late-twentieth-century phase of the arms race, the role of unpredictable chance increased. When hours (or days) and miles (or hundreds of miles) separate defeat from victory, and therefore an error of command can be remedied by throwing in reserves, or retreating, or counterattacking, then there is room to reduce the element of chance. But when micromillimeters and nanoseconds determine the outcome, then chance enters like a god of war, deciding victory or defeat; it is magnified and lifted out of the microscopic scale of atomic physics. The fastest, best weapons system comes up against the Heisenberg uncertainty principle, which nothing can overcome, because that principle is a basic property of matter in the Universe. It need not be a computer breakdown in satellite reconnaissance or in missiles whose warheads parry defenses with laser beams; if a series of electronic defensive impulses is even a billionth of a second slow in meeting a similar series of offensive impulses, that is enough for a toss of the dice to decide the outcome of the Final Encounter.
Unaware of this state of affairs, the major antagonists of the planet devised two opposite strategies. One can call them the "scalpel" and the "hammer." The constant escalation of pay-load megatonnage was the hammer; the improvement of detection and swift destruction in flight was the scalpel. They also reckoned on the deterrent of the "dead man's revenge": the enemy would realize that even in winning he would perish, since a totally obliterated country would still respond -- automatically and posthumously -- with a strike that would make defeat universal. Such was the direction the arms race was taking, and such was its destination, which no one wanted but no one knew how to avoid.
How does the engineer minimize error in a very large, very complex system? He does trial runs to test it; he looks for weak spots, weak links. But there was no way of testing a system designed to wage global nuclear war, a system made up of surface, submarine, air-launched, and satellite missiles, antimissiles, and multiple centers of command and communications, ready to loose gigantic destructive forces in wave on wave of reciprocal atomic strikes. No maneuvers, no computer simulation, could re-create the actual conditions of such a battle.
Unaware of this state of affairs, the major antagonists of the planet devised two opposite strategies. One can call them the "scalpel" and the "hammer." The constant escalation of pay-load megatonnage was the hammer; the improvement of detection and swift destruction in flight was the scalpel. They also reckoned on the deterrent of the "dead man's revenge": the enemy would realize that even in winning he would perish, since a totally obliterated country would still respond -- automatically and posthumously -- with a strike that would make defeat universal. Such was the direction the arms race was taking, and such was its destination, which no one wanted but no one knew how to avoid.
How does the engineer minimize error in a very large, very complex system? He does trial runs to test it; he looks for weak spots, weak links. But there was no way of testing a system designed to wage global nuclear war, a system made up of surface, submarine, air-launched, and satellite missiles, antimissiles, and multiple centers of command and communications, ready to loose gigantic destructive forces in wave on wave of reciprocal atomic strikes. No maneuvers, no computer simulation, could re-create the actual conditions of such a battle.

Increasing speed of operation marked each new weapons system, particularly the decision-making function (to strike or not to strike, where, how, with what force held in reserve, at what risk, etc.), and this increasing speed also brought the incalculable factor of chance into play. Lightning-fast systems made lightning-fast mistakes. When a fraction of a second determined the safety or destruction of a region, a great metropolis, an industrial complex, or a large fleet, it was impossible to achieve military certainty. One could even say that victory had ceased to be distinguishable from defeat. In a word, the arms race was heading toward a Pyrrhic situation."