05/16/2012 04:02 am ET Updated Jul 15, 2012

As Trained Afghans Turned Enemy, A U.S.-Led Imperative Is At Danger

COMBAT OUTPOST SANGESAR, Afghanistan -- A burst of gunfire snapped First Sgt. Joseph Hissong awake. Then came another, and another, all with the familiar three-round bursts of an American assault rifle -- and the unfamiliar sound of its rounds being fired in his direction.

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