WTC workers scrawl graffiti of defiance, hope - Article Photos 1/12

FILE- In this Aug. 2, 2012 file photo, a construction worker signs a ceremonial steel beam at One World Trade Center in New York. The beam was signed by President Barack Obama with the notes: "We remember," ''We rebuild" and "We come back stronger!" during a ceremony at the construction site June 14. The beam, having since adorned with the autographs of workers and police officers at the site, will be sealed into the structure of the tower, which is scheduled for completion in 2014. (AP Photo/Mark Lennihan, File)