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.

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