Over several days of questioning in 2008, the detainee provided precise directions on how to find the secret headquarters for the insurgent group's media wing, down to the color of the front door and the times of days when the office would be occupied. When asked about the group's No. 2 leader - a Moroccan-born Swede named Abu Qaswarah - he drew maps of the man's compound and gave up the name of Qaswarah's personal courier.

Weeks after those revelations, U.S. soldiers killed Qaswarah in a raid in the Iraqi city of Mosul. Meanwhile, the detainee, U.S. officials say, would go on to become famous under a different name: Abu Ibrahim al-Hashimi al-Qurashi - the current leader of the Islamic State.