The amphibious transport dock ship Pre Commissioning Unit (PCU) New York (LPD 21) under construction in Northrop Grumman Ship the shipyard. It is the fifth ship to be built in the San Antonio-class of amphibious ships. The bow stem is made of steel from the World Trade Centers and weighs 7.5 metric tons. New York is scheduled to be commissioned in the fall of 2008. U.S. As the ship nears 50 percent completion, the most unique characteristic of the LPD 21 New York's construction process is that the bow stem was formed using steel from the World Trade Center (WTC). In August 2005 NGSS finished construction of the bow stem. Hoisting and welding the 7.5-metric ton bow stem to the ship was completed in August 2006. “It’s a tremendous feeling,” said Capt.