U.S. Marines with 1st Platoon, Company I, 3rd Battalion, 5th Marines (3/5), Regimental Combat Team 2, in Afghanistan. (January 2010 file photo.) Corporal David R. Hernandez/3rd Battalion 5th Marines-RCT 2 hide caption

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Amb. James Cunningham on who is attacking U.S. troops

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Aug. 13: At Dover Air Force Base in Delaware, the remains of Marine Lance Cpl. Gregory T. Buckley are carried during a dignified transfer. He was killed in a "green on blue" attack. Mark Wilson/Getty Images hide caption

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Soraya Sarhaddi Nelson speaks with David Greene on 'Morning Edition'

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At a road project in Qalat, Afghanistan, last summer, U.S. forces were providing security. U.S. Air Force Staff Sgt.Brian Ferguson /Reuters /Landov hide caption

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Former Ambassador Ryan Crocker speaks with Renee Montagne

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Sean Carberry, in his second report on the defections

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