Ironworkers Martin Duffy, left, Barry Collins, center, and Dennis Byrnes attend a ceremony for the September 11 cross, Saturday, July 23, 2011 in New York. After the ceremony, the cross was installed at the National September 11 Memorial and Museum. It was discovered upright in the ruins of ground zero following the attacks of September 11, 2001. (AP Photo/Mark Lennihan)

Associated Press
Ironworkers Martin Duffy, left, Barry Collins, center, and Dennis Byrnes attend  a ceremony for the September 11 cross, Saturday, July 23, 2011 in New York.  After the ceremony, the cross was installed at the National September 11 Memorial and Museum. It was discovered upright in the ruins of ground zero following the attacks of September 11, 2001. (AP Photo/Mark Lennihan)
Ironworkers Martin Duffy, left, Barry Collins, center, and Dennis Byrnes attend a ceremony for the September 11 cross, Saturday, July 23, 2011 in New York. After the ceremony, the cross was installed at the National September 11 Memorial and Museum. It was discovered upright in the ruins of ground zero following the attacks of September 11, 2001. (AP Photo/Mark Lennihan)
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