The Pentagon 9/11 Memorial

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This Sunday Aug. 7 2011 phoshows lights as they illuminate 184 stone benches outside PentagArlingtVa. | AP

This Sunday, Aug. 7, 2011 photo shows lights as they illuminate the 184 stone benches outside the Pentagon in Arlington, Va. | AP

Flowers rest bench as visitors PentagMemorial WashingtDC tour through memorial September 3 2011 days before 10th Anniversary September 11 2001

Flowers rest on a bench as visitors to the Pentagon Memorial in Washington, DC, tour through the memorial on September 3, 2011, days before the 10th Anniversary of the September 11, 2001 which saw attacks in New York, Shanksville, Pennsylvania, and Washin

Visitors PentagMemorial WashingtDC take moment rest as they tour through memorial September 3 2011 days before 10th Anniversary September 11

Visitors to the Pentagon Memorial in Washington, DC, take a moment to rest as they tour through the memorial on September 3, 2011, days before the 10th Anniversary of the September 11, 2001 which saw attacks in New York, Shanksville, Pennsylvania, and Was

Visitors walk through PentagMemorial WashingtDC September 3 2011 days before 10th Anniversary September 11 2001 which saw attacks New York

Visitors walk through the Pentagon Memorial in Washington, DC, on September 3, 2011, days before the 10th Anniversary of the September 11, 2001 which saw attacks in New York, Shanksville, Pennsylvania, and Washington, DC. | JIM WATSON/AFP/Getty Images

This Sunday Aug. 7 2011 phoshows visitors as they walk by benches PentagMemorial outside Pentagbuilding ArlingtVa. The Pentagwas first three

This Sunday, Aug. 7, 2011 photo shows visitors as they walk by benches at the Pentagon Memorial outside of the Pentagon building in Arlington Va. The Pentagon was the first of the three attack sites to open an official memorial. It was dedicated Sept. 11,

This Sunday Aug. 7 2011 phoshows visitor PentagMemorial as he reads names people who died Sept. 11 2001 terrorist attack

This Sunday, Aug. 7, 2011 photo shows a visitor to the Pentagon Memorial as he reads the names of people who died Sept. 11, 2001, in the terrorist attack on the Pentagon in Arlington, Va. | AP

This Sunday Aug. 7 2011 phoshows some 184 stone benches each bearing name perswho died Sept. 11 2001 terrorist attack

This Sunday, Aug. 7, 2011 photo shows some of the 184 stone benches, each bearing the name of a person who died Sept. 11, 2001, in the terrorist attack on the Pentagon, outside the Pentagon in Arlington, Va. | AP

184 stone benches are illuminated outside the Pentagon in Arlington, Va. Each bench bears the name of a person who died Sept. 11, 2001, in the terrorist attack on the Pentagon and together comprise the permanent outdoor Pentagon Memorial, created to honor the family members …