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2ARLINGTON, VA - SEPTEMBER 11: U.S. President Barack Obama (C) speaks as Defense Secretary Robert Gates (L) and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen (R) look on at an event marking the anniversary of the 9/11 terrorist attacks at the Pentagon Memorial September 11, 2010 in Arlington, Virginia. President Obama will deliver remarks, lay a wreath and meet with families of the victims during the event on the ninth anniversary of the tragedy. (Photo by Olivier Douliery-Pool/Getty Images) *** Local Caption *** Michael Mulle;Robert Gates;Barack Obama