September 23rd 2011, Marines at Camp David just after raising the flag back to full staff.  Never forget September 11th 2001.

September 23rd 2011, Marines at Camp David just after raising the flag back to full staff. Never forget September 11th 2001.

Six year-old Peter Samuelson wears a firefighter hat after a memorial service at Old St. Pat's Church to mark the tenth anniversary of the September 11 terror attacks on the World Trade Center on September 11, 2011 in New York City. New York City firefighters are commemorating the 10th anniversary of the 9/11 terrorist attacks and honoring the 343 firefighters who died in the line of duty. (Photo by Justin Sullivan/Getty Images)

Six year-old Peter Samuelson wears a firefighter hat after a memorial service at Old St. Pat's Church to mark the tenth anniversary of the September 11 terror attacks on the World Trade Center on September 11, 2011 in New York City. New York City firefighters are commemorating the 10th anniversary of the 9/11 terrorist attacks and honoring the 343 firefighters who died in the line of duty. (Photo by Justin Sullivan/Getty Images)

An American flag is unfurled during a commemoration to mark the 10th anniversary of the Sept. 11 attacks on the United States, at the Trocadero plaza , near the Eiffel tower, seen in the background, in Paris, Sunday, Sept. 11, 2011. (AP Photo/Thibault Camus)...

An American flag is unfurled during a commemoration to mark the 10th anniversary of the Sept. 11 attacks on the United States, at the Trocadero plaza , near the Eiffel tower, seen in the background, in Paris, Sunday, Sept. 11, 2011. (AP Photo/Thibault Camus)...

Members of Clerkenwell Fire Station's Green Watch observe a minutes silence for their fellow fire-fighters who lost their lives in the 9/11 terrorist attacks in New York, September 11, 2011 in London, England. Ceremonies held around the world have joined Washington and New York as they commemorate the tenth anniversary of the 9/11 terrorist attacks where nearly 3000 people died when four hijacked airliners were used in coordinated attacks against the United States. (Photo by Peter…

Members of Clerkenwell Fire Station's Green Watch observe a minutes silence for their fellow fire-fighters who lost their lives in the 9/11 terrorist attacks in New York, September 11, 2011 in London, England. Ceremonies held around the world have joined Washington and New York as they commemorate the tenth anniversary of the 9/11 terrorist attacks where nearly 3000 people died when four hijacked airliners were used in coordinated attacks against the United States. (Photo by Peter…

One World Trade Center, center, is illuminated in red, white, and blue prior to the visit of President Barack Obama to the September 11 Memorial, Thursday, May 5, 2011 in New York. Osama bin was killed May 2, 2011.

9/11 Memorials

One World Trade Center, center, is illuminated in red, white, and blue prior to the visit of President Barack Obama to the September 11 Memorial, Thursday, May 5, 2011 in New York. Osama bin was killed May 2, 2011.

3000 flags line the Pentagon Healing Field where each flag represents a victim of the September 11 attacks, at the September 11 Pentagon Memorial Thursday, Sept. 11, 2008 at the Pentagon in Washington. (AP Photo/Evan Vucci)

9/11 Memorials

3000 flags line the Pentagon Healing Field where each flag represents a victim of the September 11 attacks, at the September 11 Pentagon Memorial Thursday, Sept. 11, 2008 at the Pentagon in Washington. (AP Photo/Evan Vucci)

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