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402136 03: Lt. Col Brian Birdwell (L) who was injured at the Pentagon on September 11 and his wife Jan listen to U.S. President George W. Bush speak during a ceremony for the six month anniversary of the terrorist attacks on the World Trade Center and Pentagon, March 11, 2002 at the White House, in Washington, DC. Ceremonies were held at the White House and the World Trade Center disaster site in remembrance of the victims of the attacks. (Photo by Mark Wilson/Getty Images)

402136 03: Lt. Col Brian Birdwell (L) who was injured at the Pentagon on September 11 and his wife Jan listen to U.S. President George W. Bush speak during a ceremony for the six month anniversary of the terrorist attacks on the World Trade Center and Pentagon, March 11, 2002 at the White House, in Washington, DC. Ceremonies were held at the White House and the World Trade Center disaster site in remembrance of the victims of the attacks. (Photo by Mark Wilson/Getty Images)