Air Force ROTC cadets in the 536 Detachment salute World Trade Center beams as the National Anthem is played on Sept. 11, 2006, during a memorial ceremony at Clarkson University in Potsdam, N.Y. Clarkson alumnus Michael Bielawa, who supervised cleanup efforts at ground zero, donated three pieces of structural steel to the school, two of which were identified as part of the 55th floor of the south tower.
(Photo: AP Photo/Christopher Lenney)
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