Science: NORAD: DEFENSE OF A CONTINENT

ACROSS the North American continent from the edge of the polar icecap to the Mexican border lies a vast and wondrously intricate system of aerial defenses. Built over a period of nine years at a cost of more than $18 billion, based upon radar networks within networks electronically tied to the most modern systems of detection and interception (see color pages), it was never considered foolproof against penetration. A defense in depth, it was designed to—and will—limit to a minimum the breakthroughs of Soviet long-range bombers coming to pour nuclear destruction on the...

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