On Saturday night, an Afghan soldier approached Americans, killing a soldier and a contractor; with that, the number of soldiers killed in Afghanistan is around 2,100 in the United States’ 11-year-war in the country. Insider attacks have become increasingly common – and no one seems to have a good answer about how to stop them. NBC’s Lester Holt and Richard Engel report from Kabul.Oct. 1, 2012
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