9/11: Ten years later

Chairman of the Joint Chiefs of Staff Michael Mullen, Secretary of Defense Leon Panetta, and Vice President Joe Biden observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia.

( Photo by Win McNamee/Getty Images )

Chairman of the Joint Chiefs of Staff Michael Mullen, Secretary of Defense Leon Panetta, and Vice President Joe Biden observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia.

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