Port Authority Sgt. Christopher Bergman, center, a 9/11 first responder who lost friends in the attack, looks on as the USS New York, a Navy amphibious assault ship containing 7.5 tons of steel salvaged from the World Trade Center, gets formally commissioned in New York Saturday Nov. 7, 2009. The $1 billion warship was built near New Orleans by workers who survived Hurricane Katrina. (AP Photo/David Goldman)AP – The USS New York, built with steel from the rubble of the World Trade Center, was put into Navy service Saturday both as a symbol of healing and strength.