Pentagon 9/11 Memorial

ARLINGTON, VA - SEPTEMBER 14, 2001: A military helicopter flies in front of the Pentagon at the impact site where a hijacked airliner crashed into the building September 14, 2001 in Arlington, Virginia. This September 11 marks ten years since members of Al Qaeda hijacked four planes, attacking the World Trade Center and the Pentagon and crashing one in Shanksville, Pennsylvania, killing nearly 3,000 people in all. The effects continue to resonate across the global political landscape, as the United States concluded a nearly decade-long search for Al Qaeda leader Osama bin Laden, killing him in May 2011, and struggles to wind down two wars in Afghanistan and Iraq. (Photo by Stephen J. Boitano/Getty Images)

ARLINGTON, VA - JUNE 28: Groundskeeper Lucas Guzman washes the glowing light pool of a bench at the Pentagon Memorial June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: Transportation Security Administration (TSA) Puppy Program Manager Scott Thomas holds puppies Hoey (L) and Hatton as he talks to members of the press during a media day at the Pentagon June 28, 2011 in Arlington, Virginia. The puppy program breeds and prepares puppies to be future explosives detection dogs at airports and mass transit systems nationwide. Each puppy is named in honor of a victim of 9/11 or after a military member who gave their life during the war on terror. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A model of the Pentagon Memorial is on display at the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A quilt hangs on a wall of the Pentagon Memorial Quilts Corridor where 21 quilts, of more than 100 in the collection that serve as a historical record of the tragic events of 9/11, are on display June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A quilt that features the victims of the Pentagon attack hangs on a wall of the Pentagon Memorial Quilts Corridor where 21 quilts, of more than 100 in the collection that serve as a historical record of the tragic events of 9/11, are on display June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A man passes by the Pentagon Memorial Quilts Corridor where 21 quilts, of more than 100 in the collection that serve as a historical record of the tragic events of 9/11, are on display June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: Items that were associated with 9/11 attacks are on display in a showcase at the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: Items that were associated with 9/11 attacks are displayed in a showcase at the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A window display features a Purple Heart at the Memorial Chapel of the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A stained glass window is seen at the Memorial Chapel of the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A stained glass window is seen at the Memorial Chapel of the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A flag with names of all 184 victims in the Pentagon attack hangs on a wall at the Memorial Chapel of the Pentagon June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA - JUNE 28: A woman walks on the ground of the Pentagon Memorial June 28, 2011 in Arlington, Virginia. This year is the 10th anniversary of the September 11 terrorist attacks, in which 184 people were killed at the Pentagon. (Photo by Alex Wong/Getty Images)

ARLINGTON, VA- MAY 05: U.S. Vice President Joseph Biden (L), and Secretary of Defnse Robert Gates (2nd L) participate in a wreath laying ceremony to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, on May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - MAY 05: A wreath stands at the wall of the Pentagon to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - MAY 05: U.S. Vice President Joseph Biden (C), and U.S. Secretary of Defense Robert Gates (2nd-L) participate in a wreath laying ceremony to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - MAY 05: U.S. Vice President Joseph Biden lays a wreath during a ceremony to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA- MAY 05: U.S. Vice President Joseph Biden lays a wreath during a ceremony to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, on May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - MAY 05: U.S. Vice President Joseph Biden (L), and U.S. Secretary of Defense Robert Gates (R) participate in a wreath laying ceremony to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - MAY 05: A stone block that survived the September 11, 2001 terrorist attack at the Pentagon is shown May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - MAY 05: Former U.S. Secretary of Defense Donald Rumsfeld attends a wreath laying ceremony to honor the victims of the September 11, 2001 terrorist attack at the Pentagon, May 5, 2011 in Arlington, Virginia. Earlier this week U.S. President Barack Obama announced that Osama Bin Laden was killed during a special force led operation in a house in Abbottabad, Pakistan. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates gets up after speaking about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates speaks about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

ARLINGTON, VA - FEBRUARY 14: Defense Secretary Robert Gates arrives to speak about the Defense Department's FY2012 Budget request during a briefing at the Pentagon on February 14, 2011 in Arlington, Virginia. The Pentagon proposed a reduced defense budget for the first time since the September 11 attacks as U.S. President Barack Obama released his FY2012 Budget proposal. (Photo by Mark Wilson/Getty Images)

WASHINGTON - SEPTEMBER 11: (FILE PHOTO) U.S. President George W. Bush bows his head during a moment of silence on the South Lawn of the White House, September 11, 2007 in Washington, DC. Today marks the sixth anniversary of the September 11, 2001 terror attacks, when terrorists high jacked airliners and flew them in the World Trade Center and the Pentagon. (Photo by Mark Wilson/Getty Images) On Wednesday, July 6, 2011 Former US President George W Bush Celebrates His 65th Birthday Please refer to the following profile on Getty Images Archival for further imagery. http://www.gettyimages.co.uk/Search/Search.aspx?EventId=96780293&EditorialProduct=Archival