Word: lookdown
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...Soviets have a serious weakness: they have developed only a very crude "lookdown" radar, capable of spotting low-flying planes or missiles only over water. The U.S. has such radar in its Airborne Warning and Control System (AWACS) planes. The Soviets, however, have not yet figured out how to distinguish an airplane or missile from ground clutter. Before they solve this problem and deploy look-down radar (which may not happen until the 1980s), U.S. bombers will be able to penetrate Soviet borders...
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