September 17, 2012 -- Updated 0645 GMT (1445 HKT)

U.S. Marine Greg Buckley Jr., deployed to Afghanistan, sensed that an attack was imminent and that it would come from within, after haunting words from an Afghan trainee. FULL STORY | AFGHAN WAR: WHEN ALLIES ARE ENEMIES  AFGHAN WAR: WHEN ALLIES ARE ENEMIES

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See the powerful follow-up to CNN's award-winning documentary "Death in the Desert" - Premieres Friday: 1730 Berlin, 1930 Abu Dhabi, 2330 Hong Kong