A guard wears a protective face shield, after he was asked to demonstrate its use by a correspondent, in the "Camp Five" detention facility at U.S. Naval Station Guantanamo Bay December 10, 2008, in this image reviewed by the U.S. military. The shield is to protect the guards from human waste which is thrown at them by the detainees. Camp Five, modelled after a U.S. maximum security facility, houses the most uncooperative detainees, along with those of high intelligence value. REUTERS/Mandel Ngan/Pool (CUBA)