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So the Taliban was saying that they would kill him if the US failed to make the deal?
Seems like a colossal fuck up imo.
Is there evidence of his letter home and of him joining the Taliban, or is...

Sorry need a little more detail here... if he voluntarily left, why was the trade made? From your description, it doesn't sound like he was captured or held prisoner. If he deserted, what was the...

I'm not fully aware of the circumstances so I don't feel right tossing my hat into the ring yet. Can somebody fill in the blanks for those who aren't up to speed?