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9/11: Ten years later

People arrive for a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States.Photo by Brendan Smialowski/Getty Images