A group of detainees kneels during an early-morning Islamic prayer in their camp at the U.S. military prison for "enemy combatants" in 2009 in Guantanamo Bay, Cuba. John Moore/Getty Images hide caption

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A U.S. military guard carries shackles in preparation for moving a detainee at the U.S. detention center in Guantanamo Bay, Cuba. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images