The USS New York, a U.S. Navy battleship, includes 7.5 tons of steel recovered from the rubble of the World Trade Center in its bow.

The steel was melted down to cast the ship's "stem bar," part of its bow, and represents a small fraction of its total weight.

The ship set sail for the first time from New Orleans on Oct. 13, 2009, and passed the World Trade Center site on Nov. 2, 2009, on its way to its commissioning ceremonies in New York City, pausing to give Ground Zero a 21-gun salute.

The New York's motto, "Strength Forged Through Sacrifice - Never Forget," pays homage to the victims and first responders of the attacks.

World Trade Center cross

Some pieces of steel from the World Trade Center didn't need any work to be reused. Such was the case with the World Trade Center Cross, a group of steel beams found amid the World Trade Center debris that resembles a Christian cross.

The cross was discovered in the debris on Sept. 13, 2001, and eventually erected on a pedestal and moved to a nearby plaza overlooking the site's cleanup and reconstruction.

During construction of a new subway station and office tower at the site, the cross was moved to St. Peter's Church, which faces the World Trade Center site, on Oct. 5, 2006.

The cross was returned to the World Trade Center site in late July to be installed as a permanent exhibit in the National September 11th Memorial and Museum.

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