The USS Somerset is named for the southwestern Pennsylvania county where Flight 93 crashed. With its 684-foot starboard side serving as the backdrop, the amphibious transport dock warship was formally commissioned in front of more than 5,000 spectators at Penn's Landing.
"What we commemorate is not that war or an attack on America," said Sen. Pat Toomey. "We commemorate the day America began to fight back.
The Somerset is the third ship to be named in honor of 9/11 victims, joining the USS New York and USS Arlington, which honor those killed in the World Trade Center towers and the Pentagon during the attacks.
After its crew manned the ship, the Somerset's commanding officer, Capt. Thomas Dearborn, said, "Somerset, let's roll," paying homage to Flight 93 passenger Todd Beamer's famous rallying cry. Beamer helped lead the passenger rebellion that led to the plane crashing about 50 miles southeast of Pittsburgh. Investigators believe the hijackers planned to target the White House or Capitol.
The Somerset was christened in Avondale, La., at the Huntington Ingalls shipyard in 2012 and delivered to the U.S. Navy in October 2013.
For some of the victims' families in attendance, the ship symbolized a memorial of their loved ones, but didn't ease the pain of losing them.
"I'd rather have him instead of the ship," Rodrick Thornton, 68, of Radcliff, Ky., said of his cousin LeRoy Homer Jr., the first officer of Flight 93.
Carol Heiderich, whose brother Capt.
"It's such an honor to have our family members remembered in this way," said Heiderich, 59, of Hollister, Calif.
Dave Whelan, a cousin of Flight 93 passenger Richard Guadagno, said the ship embodied the spirit of the country.
"This is us, this is our country," said Whelan, 67, of Jackson, N.J. "This ship and the people on it will be prepared to do whatever they have to do."
"It's showing honor to our family members, to the heroes of Flight 93," said Whelan's wife, Carol. "It shows that we're not forgetting. It's been many years now and I'm hoping that 50 years from now when my grandson goes to Shanksville, they still remember."