EVER since the development of missiles that could span continents, the possibility of nuclear-armed rockets arcing over the horizon from a hostile nation has been a nightmare for U.S. planners. How could such monstrous weapons be dealt with? How could the nation avert a death toll of hundreds of millions of its people? For 14 years, military men and scientists have labored mightily to devise some protection against such an eventuality. The principal result of their efforts is the Sentinel anti-ballistic-missile system, a complex of nuclear-tipped rockets and radars aimed at crippling inbound enemy warheads before they can hit their targets...
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