WITH uncanny accuracy, U.S. flyers are now selectively knocking out targets in North Viet Nam that defied destruction during the massive American bombing of four and five years ago. What makes the difference is a new generation of so-called "smart" bombs, with highly sophisticated electronic guidance systems, which can be launched a mile away from the target. As a result, despite the improvement of North Viet Nam's air defenses, the U.S. is losing fewer planes while destroying more targets. In the past two weeks alone, smart bombs have enabled U.S. flyers to take...
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