THE IDEA: The Department of Defense is designing nonnuclear intercontinental ballistic missiles, which could be operational in less than two years. Packed with conventional explosives, they would be able to strike pretty much anywhere on the planet within one hour. ICBMs travel above the atmosphere, so they avoid most radar systems and the airspace of countries en route. For this capability, the U.S. is "willing to pay a great deal," says Mark Lewis, the Air Force's top technology official until his retirement this year.
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