Hiwa Abdul Rahman Rashul, nicknamed Triple-X by his American guards, was the first ghost detainee to be publicly acknowledged by American authorities.
[1] Captured by Kurdish forces in Iraq in June or July 2003, he was turned over to the CIA who believed he was a member of Ansar al-Islam.
On June 16, 2004 Secretary of Defense Donald Rumsfeld acknowledged that he had ordered Rashul to be imprisoned without record, at the request of DCI George Tenet.
Rashul was nicknamed "Triple-X" because, since he was kept off the books, his guards never learned his real name.
Because of the order to keep him off the books those who would have interrogated him forgot about him, or could not find him.