Taliban

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** FILE ** U.S. Marines take cover in Dahaneh, a long-standing Taliban stronghold in southern Helmand Province. (Associated Press)

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Sgt. Bowe Bergdahl, who was held captive by the Taliban for nearly five years, is seen mugging for a picture with an alleged Taliban official in Afghanistan. (Twitter photo @khorasan313)

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200 oil tanker trucks supplying fuel for NATO forces were set ablaze by Taliban militants outside the Afghan capital Kabul, July 5, 2014. (Image: Chicago Tribune video screen shot)

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Sgt. Bowe Bergdahl is the only U.S. troop to have been taken hostage by the Taliban in the long, hard-fought Afghanistan War. (U.S. Army Via Associated Press)

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Pakistani Taliban patrol in their stronghold of Shawal in Pakistani tribal region of South Waziristan. (AP Photo/Ishtiaq Mahsud, File)

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** FILE ** In this file image taken from video obtained from Voice Of Jihad Website, which has been authenticated based on its contents and other AP reporting, Sgt. Bowe Bergdahl, sits in a vehicle guarded by the Taliban in eastern Afghanistan. (AP Photo/Voice Of Jihad Website via AP video, File)