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

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U.S. military guards arrive for their sunrise shift at Camp Delta at the U.S. detention center in Guantanamo Bay, Cuba. John Moore/Getty Images hide caption

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Mine helmets and painted crosses sit at the entrance to Massey Energy's Upper Big Branch coal mine, a memorial to the 29 miners killed in an explosion April 5, 2010. Jeff Gentner/AP hide caption

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Mine helmets and painted crosses sit at the entrance to Massey Energy's Upper Big Branch coal mine April 5 in Montcoal, W.Va. The memorial represents the 29 coal miners who were killed in an explosion at the mine a year ago. Jeff Gentner/AP hide caption

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