A holding pen used to transfer prisoners and materials is seen in an an unoccupied communal cellblock at Camp VI, a prison used to house detainees at the U.S. Naval Base at Guantanamo Bay March 5, 2013. The facility is operated by the Joint Task Force Guantanamo and holds prisoners who have been captured in the war in Afghanistan and elsewhere since the September 11, 2001 attacks. Picture taken March 5, 2013. REUTERS/Bob Strong (CUBA - Tags: POLITICS MILITARY CRIME LAW)