USS New York (LPD-21), the fifth San Antonio-class  amphibious transport dock, is the  sixth ship of the United States Navy to be named after the state of New York. The New York has a crew of 360, and  can also carry up to 700 Marines. The ship is notable for  using steel that was salvaged from the World Trade Center, after it was destroyed in the September 11 attacks.
      The ship is the first to be designed fully from the CAD-screen up to  support all three of the Marines' primary mobility capabilities — the Expeditionary Fighting Vehicle  (EFV), Landing Craft Air Cushion and MV-22B  Osprey.
      Shortly after 11 September 2001, Governor of New York George E. Pataki wrote a letter to Secretary of the Navy Gordon R. England requesting that the Navy bestow the name  USS New York on a surface warship involved in the War on Terrorism in honor of September 11's victims.
       The contract to build the New York was awarded to Northrop Grumman Ship Systems  of New Orleans, Louisiana,  in 2003. The New York was under construction in New Orleans at  the time of Hurricane Katrina in 2005
World Trade  Center steel
      7.5 short tons (6.8 t) of the steel used in the ship's construction  came from the rubble of the World Trade Center; this represents less  than one thousandth of the total weight of the ship.  The steel was melted down at Amite Foundry and Machine in Amite, Louisiana, to cast the ship's bow  section. It was poured into the molds on 9 September 2003, with 7 short  tons (6.4 t) cast to form the ship's "stem bar" — part of the ship's  bow.  The shipyard workers reportedly treated it with "reverence usually  accorded to religious relics", gently touching it as they walked by. One  worker delayed his retirement after 40 years' work to be part of the  project.
Aircraft
      At the stern of the ship the landing deck is able to accommodate two  Sikorsky CH-53E Sea Stallion helicopters, six Bell AH-1W Super Cobra  helicopters, four Boeing CH-46 Sea Knight helicopters or two Boeing Bell  MV-22 Osprey tiltrotor aircraft.
      The hangar deck provides aviation maintenance facilities and is  sufficiently large to accommodate one Sea Stallion, two Sea Knight,  three Super Cobra helicopters or one MV-22 Osprey tiltrotor aircraft.  The hangar doors are constructed by Indal Technologies. Each  blast-resistant door weighs 18,000kg and has three horizontal folding  panels.
       USS San Antonio began flight operations testing with the V-22 Osprey  tiltrotor and CH-46 Sea Knight helicopter in June 2006.



 
 



