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In a trailer at the Guantanamo Bay naval base, a military hearing room sits empty before a detainee appears for proceedings.

President Obama signed an executive order yesterday approving a formal system of indefinite detentions, and the administration announced it would hold new military trials for detainees. Obama has long said military trials are appropriate for some Guantanamo detainees, while civil-liberties groups have objected.

Credit: AP Photo/Brennan Linsley