This image from television footage shows John Walker Lindh in Afghanistan on Dec. 1, 2001. Lindh was a Taliban soldier who was captured at that time. Having served 17 years of a 20-year sentence, he is scheduled to be released from a U.S. federal prison on Thursday. In the coming years, dozens of Americans linked to extremist groups are in line to be released from U.S. prisons.

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This image from television footage shows John Walker Lindh in Afghanistan on Dec. 1, 2001. Lindh was a Taliban soldier who was captured at that time. Having served 17 years of a 20-year sentence, he is scheduled to be released from a U.S. federal prison on Thursday. In the coming years, dozens of Americans linked to extremist groups are in line to be released from U.S. prison