NEW ORLEANS, La. – The Northrop Grumman-built New York, LPD 21, performed builder's sea trials this week in the Gulf of Mexico. The ship's bow stem contains seven-and-a-half tons of steel recovered from the World Trade Center following the terrorist attacks of Sept. 11, 2001. LPD 21 is being built at the company's Avondale facility in Louisiana. New York is the fifth amphibious transport dock ship in the San Antonio class of amphibious assault force. The 684-foot, 105-foot-wide LPD transport dock ships are used to transport and land Marines, equipment and supplies by embarked air cushioned or conventional landing craft, expeditionary fighting vehicles, amphibious assault vehicles, helicopters, and vertical take off and landing aircraft. (Source: Northrop Grumman, 07/02/09)