8/17: More U.S. troops killed by Afghan allies; saying goodbye to a local legend

      |It has happened again - two American military men were killed in Afghanistan by an Afghan policeman. David Martin reports on the latest victims in a disturbing trend of allied violence; And, Steve Hartman revisits Woody Davis of Corbett, Oregon, who touched his local community with his generosity. Residents were able to return the favor during Davis' final months as he battled Lou Gehrig's disease.

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