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GUANTANAMO BAY, CUBA - JANUARY 20:  (NOTE TO EDITORS: PHOTO HAS BEEN REVIEWED BY US MILITARY OFFICIALS) U.S. Navy Chief Petty Officer Bill Mesta replaces an official picture of outgoing President George W. Bush with that of newly- sworn-in U.S. President Barack Obama, in the lobby of the headquarters of the U.S. Naval Base January 20, 2009 in Guantanamo Bay, Cuba.  Bush's eight-year presidency, which has overseen the detention of prisoners at Guantanamo and elsewhere, concluded midday today, and President Barack Obama has said he intends to close the offshore prison and move the trials to U.S. courts. (Photo by Brennan Linsley-Pool/Getty Images)
GUANTANAMO BAY, CUBA - JANUARY 20:  (NOTE TO EDITORS: PHOTO HAS BEEN REVIEWED BY US MILITARY OFFICIALS) U.S. Navy Chief Petty Officer Bill Mesta replaces an official picture of outgoing President George W. Bush with that of newly- sworn-in U.S. President Barack Obama, in the lobby of the headquarters of the U.S. Naval Base January 20, 2009 in Guantanamo Bay, Cuba.  Bush's eight-year presidency, which has overseen the detention of prisoners at Guantanamo and elsewhere, concluded midday today, and President Barack Obama has said he intends to close the offshore prison and move the trials to U.S. courts. (Photo by Brennan Linsley-Pool/Getty Images)

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