National Security

August 6, 2014 8:01 PM

‘Green-on-blue’ killings in Afghanistan raise tough questions about U.S. strategy

In the hours after a suspected coalition-trained Afghan soldier opened fire at Afghanistan’s national defense university, killing an American two-star general and injuring more than a dozen others, a question that has plagued U.S. efforts arose again in quiet murmurs at coalition bases and camps across that country:

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