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Nuclear-weapons challenges rise

Bush and Pentagon call for new kinds of nukes - and a missile defense system - as bombs' toxic legacy lingers.

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At a time when all eyes are on fighting what the Pentagon calls the "Global War on Terrorism," the United States is having to address the past, present, and future of nuclear conflict.

• Sixty years after the Manhattan Project produced the first and only atomic bombs ever dropped on an enemy, the US continues to struggle with how to permanently dispose of the radioactive and chemical byproducts of its cold-war weapons of mass destruction. The Senate recently voted to allow the Energy Department to reclassify such waste so that it could stay in place, even though some of it is leaking into the air and ground water.

• As the nature of warfare changes, the Bush administration is considering new kinds of nuclear bombs. These include smaller "tactical nukes" meant to pack a bigger punch than any conventional weapon, as well as "bunker busters" designed to penetrate an enemy's deep command and weapons-storage sites.

• And in case Russia, North Korea, or some other nuclear power should fire missiles at the US, the administration is pushing ahead on ground-based systems to try to knock down incoming warheads.

Some experts see signs that space-based missile defenses - of the type envisioned in former President Reagan's "star wars" initiative 20 years ago - may be in the works as well.

All of this is highly controversial and very expensive.

Defending against missile attack

Last month, 31 former government officials urged the Bush administration to delay the national missile-defense deployment scheduled for later this year. Interceptor missiles are to be deployed in Alaska and California. These former senior defense and arms-control officials, representing every administration since Dwight Eisenhower's, say the Bush program is "missing major components." "This is like rolling out a new automobile that is missing tires, steering wheel, and brakes and hasn't been tested on the open road," says Philip Coyle, former Pentagon chief of operational test and evaluation.

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