January 29, 2010 5:23 PM

New U.S. air strategy in Afghanistan: First, do no harm

Six months after Army Gen. Stanley McChrystal, the top U.S commander in Afghanistan, issued a tactical directive urging troops to walk away from a fight rather than risk killing civilians, the Air Force is engaging in a campaign of restraint. Instead of air strikes, airmen increasingly are searching for places they can drop bombs that can be heard and felt, but where they're unlikely to damage buildings or hurt people.

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