World Trade Center

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*" FILE ** The twin towers of the World Trade Center burn on Sept. 11, 2001, behind the Empire State Building in New York. (Associated Press)

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**FILE** A man wipes ash from his face Sept. 11, 2001, after terrorists flew two airplanes into the World Trade Center towers, causing them to collapse. (Associated Press)

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** FILE ** In this April 17, 2012, photo, One World Trade Center, now up to 100 floors, rises above the Manhattan skyline in New York. On Monday, April 30, One World Trade Center — being built to replace the twin towers destroyed on 9/11 — gets steel columns to make its unfinished framework a little higher than the Empire State Building's observation deck, to become the tallest building in New York. (AP Photo/Mark Lennihan)

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This photo from April 27, 2012, shows the Empire State Building (center) and One World Trade Center (rear right) in New York. (Associated Press)

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The special operations team Col. Bowers personally selected all signed a flag, which he carried on the mission, along with a piece of World Trade Center steel. (Army Special Operations Command)

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Visitors stroll the grounds near one of the pools at the 9/11 memorial plaza on the World Trade Center site in New York on Monday, the first day the memorial was opened to the public and the day after the 10th anniversary. (Associated Press)

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A woman at the National September 11 Memorial on Sunday mourns the loss of her son, who died at the World Trade Center 10 years ago Sunday. (Associated Press)

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A woman pays her respects during a ceremony marking the 10th anniversary of the Sept. 11 terrorist attacks on the World Trade Center, Sunday, Sept. 11, 2011, outside the World Trade Center site in New York. (AP Photo/Oded Balilty)

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An American flag adorns the edge of the south pool of the Sept. 11 memorial in the World Trade Center site in New York Sunday, Sept. 11, 2011, on the 10th anniversary of the terrorist attacks on the trade center. (AP Photo/Aaron Showalter, Pool)

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Metal beams taken from the World Trade Center stand in front of an American flag during a memorial ceremony to commemorate the 10th anniversary of the September 11, 2001, terrorist attacks in New York City and Washington D.C. Sunday, Sept. 11, 2011, at Parc Sans Souci in downtown Lafayette, La. (AP Photo/Leslie Westbrook September 11, 2011

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American flags adorn the edge of the south pool of the Sept. 11 memorial at the World Trade Center site in New York Sunday, Sept. 11, 2011. (AP Photo/Aaron Showalter, Pool)

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A police officer pays his respects at a waterfall pool during a ceremony marking the 10th anniversary of the 9/11 attacks, at the National September 11 Memorial at the World Trade Center site Sunday, Sept. 11, 2011, in New York. (AP Photo/Matt Rourke)

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Madhu Narula, of Kings Park, N.Y., reacts after hearing the name of her daughter, Manika Narula, pictured on shirt below, as the names of the victims of 9/11 are read during a ceremony marking the 10th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Jason DeCrow)

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A prayer card for John Pocher is placed on his name engraved at the north pool of the National September 11 Memorial during a ceremony marking the 10th anniversary of the attacks, Sunday, Sept. 11, 2011 at the World Trade Center site in New York. (AP Photo/Mary Altaffer)

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Celeste Pocher embraces her daughter after finding her brother in law's name, John Pocher at the north pool at the National September 11 Memorial during a ceremony marking the 10th anniversary of the attacks at the World Trade Center, Sunday, Sept. 11, 2011 in New York. (AP Photo/Mary Altaffer)

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Vasantha Velamuri, who's husband, Sankara Sastry Velamuri, was killed in the 9/11 terrorist attacks on the World Trade Center, mourns at the place where his name is inscribed on the Sept. 11 memorial at the World Trade Center site in New York during a ceremony to mark the 10th anniversary of the attacks Sunday, Sept. 11, 2011. (AP Photo/Carolyn Cole, Pool)

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Rita Cullen, right, traces her son firefighter Tom Cullen's name from the engraving at the south pool of the National September 11 Memorial during a ceremony marking the 10th anniversary of the attacks at World Trade Center, Sunday, Sept. 11, 2011 in New York. (AP Photo/Mary Altaffer)