Flight 93 Memori...A visitor to the temporary Flight 93 memorial in Shanksville, Pa., pauses on Thursday, Sept. 11, 2008, at the angels that represent each of the 33 passengers and seven crew members who lost their lives here seven years ago. (AP Photo/Gene J. Puskar)
Memorial Service...Emergency personnel and a military bugler stand on the roof of the Pentagon, Thursday, Sept. 11, 2008, as a commercial airliner makes a landing approach at nearby Ronald Reagan National Airport during a memorial service for victims of the Sept. 11 attacks. (AP Photo/Gerald Herbert)
Mayor Bloomberg ...New York City Mayor Michael Bloomberg speaks during the memorial service at Zuccotti Park on the seventh anniversary of the terrorist attacks on the World Trade Center Thursday, Sept. 11, 2008 in New York. (AP Photo/Frank Franklin II)
Annual Manhattan...A mourner holds a picture of a victim of the Sept. 11 terrorist attacks before the start of a memorial ceremony Thursday, Sept. 11, 2008 in New York. Throngs of family members of victims and others gathered in lower Manhattan for the annual ceremony. (AP Photo/Chris Hondros, Pool)
Memorial Service...Guests listen to the calling out of names during a Memorial Service and dedication of the Pentagon Memorial, Thursday, Sept. 11, 2008 oin the anniversary of the Sept. 11 attack. (AP Photo/Gerald Herbert)
Memorial Service...Security personnel stand watch on the roof of the Pentagon, Thursday, Sept. 11, 2008, at the start of a Memorial service for the victims of the Sept. 11 Pentagon attacks. (AP Photo/Gerald Herbert)
Memorial Service...An American flags hangs from the side of the pentagon that was hit during the Sept. 11 attacks, Thursday, Sept. 11, 2008. (AP Photo/Gerald Herbert)
Memorial Service...The Pentagon Memorial, which will be dedicated today, is seen in front of the wall that was hit on Sept. 11, Thursday, Sept. 11, 2008. (AP Photo/Gerald Herbert)
Flight 93 Memori...A man visits the temporary Flight 93 memorial in Shanksville, Pa., at sunrise on Thursday, Sept. 11, 2008. (AP Photo/Gene J. Puskar)
Memorial Service...A man walks through a flag memorial at the Pentagon, Thursday, Sept. 11, 2008, during a ceremony marking the 7th anniversary of the Sept. 11 attacks on the Pentagon and World Trade Center. (AP Photo/Susan Walsh)
Memorial Service...Marcellia Golinski-Potler of Columbia, Md., shows her tattoo of the Pentagon during a memorial ceremony Thursday, Sept. 11, 2008 in memory of her father who died in the Sept. 11 attacks. (AP Photo/Susan Walsh)
Memorial Service...People walk through a flag memorial at the Pentagon during a ceremony marking the 7th anniversary of the Sept. 11 attacks on the Pentagon and World Trade Center, Thursday, Sept. 11, 2008. (AP Photo/Susan Walsh)
Flight 93 Memori...Visitors to the temporary Flight 93 memorial in Shanksville, Pa., participate in a sunrise memorial on Thursday, Sept. 11, 2008. (AP Photo/Gene J. Puskar)
Flight 93 Memori...Gene Stilp, left, of Middle Paxton Township, Pa., leads a sunrise memorial at the temporary Flight 93 memorial in Shanksville, Pa., on Thursday, Sept. 11, 2008. (AP Photo/Gene J. Puskar)
U.S. Embassy in ...Bereaved family members of Soichi Numata, who died in the Sept. 11 attacks on the World Trade Center, Numata's mother Ikuko, center, and his wife Noriko, center right, along with U.S. embassy's officials, hold moment of silence during the memorial service marking the seventh anniversary of the attacks in New York, at the U.S. Embassy in Tokyo, Japan, Thursday, Sept. 11, 2008. (AP Photo/Shizuo Kambayashi, Pool)
9/11 Memorial in...Pictures of the aftermath of the September 11 terrorist attacks on the Pentagon, left, and the World Trade Center, right, are seen at a memorial ceremony for U.S. troops marking the seventh anniversary at Camp Liberty in Baghdad, on Thursday, Sept. 11, 2008. (AP Photo/Maya Alleruzzo)
9/11 Memorial in...US Ambassador to Russia John R. Beyrle, left, speaks at Orthodox Church in America's St. Catherine the Great Martyr Cathedral after a memorial religious ceremony for marking the 7th anniversary of the Sept. 11 attacks, in Moscow on Thursday, Sept. 11, 2008. Abbot Zakhy Wood stands at right. (AP Photo)
Flight 93 Memori...A man visits the temporary Flight 93 memorial in Shanksville, Pa., at sunrise on Thursday, Sept. 11, 2008. (AP Photo/Gene J. Puskar)
Flight 93 Memori...This is the temporary Flight 93 memorial in Shanksville, Pa., on Wednesday, Sept. 10, 2008. (AP Photo/Gene J. Puskar)
Flight 93 Memori...The temporary Flight 93 memorial is seen in Shanksville, Pa., on Wednesday, Sept. 10, 2008. (AP Photo/Gene J. Puskar)
John McCain Spea...Republican presidential candidate Sen. John McCain, R-Ariz., speaks during a visit to the temporary Flight 93 memorial in Shanksville, Pa., Thursday, Sept. 11, 2008. (AP Photo/Gene J. Puskar)
President Bush a...President Bush, accompanied by Defense Secretary Robert Gates, center and former Defense Secretary Donald H. Rumsfeld, left, stands during a memorial ceremony at the Pentagon, Thursday, Sept. 11, 2008, marking the 7th anniversary of the Sept. 11 attacks on the Pentagon and World Trade Center. (AP Photo/Susan Walsh)
Condoleezza Rice...Secretary of State Condoleezza Rice wipes her eye during the dedication of Pentagon Memorial, Thursday, Sept. 11, 2008, at the Pentagon. (AP Photo/Pablo Martinez Monsivais)
President Bush S...President Bush concludes his remarks during a memorial ceremony at the Pentagon, Thursday, Sept. 11, 2008, marking the 7th anniversary of the Sept. 11 attacks on the Pentagon and World Trade Center. (AP Photo/Susan Walsh)
Memorial Service...A bell is tolled to honor each of the people killed during the Sept. 11 attacks, Thursday, Sept. 11,2008, at the Pentagon during a memorial ceremony. (AP Photo/Susan Walsh)
9/11 Memorial in...University of Wyoming Marine Corps Officer Candidate P.J. Ostlund places rows of flags for a 9/11 memorial with other students in the center of the UW campus in Laramie, Wyo. on Thursday, Sept. 11, 2008. (AP Photo/Laramie Boomerang, Ben Woloszyn)
Former Gov. Pata...Former New York State Gov. George Pataki speaks during the memorial service at Zuccotti Park near the World Trade Center site on the seventh anniversary of the terrorist attacks on the World Trade Center Thursday, Sept. 11, 2008 in New York. (AP Photo/Frank Franklin II)
Former Mayor Giu...Former New York City Mayor Rudolph Giuliani speaks during the memorial service near the World Trade Center site on the seventh anniversary of the terrorist attacks on the World Trade Center Thursday, Sept. 11, 2008 in New York. (AP Photo/Frank Franklin II)
Memorial Service...Members of a joint service honor guard prepare to raise the flag during the Pentagon Memorial dedication ceremony Sept. 11, 2008. The national memorial is the first to be dedicated to those killed at the Pentagon on Sept. 11, 2001. The site contains 184 inscribed memorial units honoring the 59 people aboard American Airlines Flight 77 and the 125 in the building who lost their lives that day. (AP Photo/Defense Dept.,Mass Communication Specialist 1st Class Chad McNeeley, U.S. Navy)
Memorial Service...Audience watches the dedication of the Pentagon Memorial Sept. 11, 2008. The national memorial is the first to be dedicated to those killed at the Pentagon on Sept. 11, 2001. The site contains 184 inscribed memorial units honoring the 59 people aboard American Airlines Flight 77 and the 125 in the building who lost their lives that day. (AP Photo/Dept of Defense, Andy Morataya, U.S. Air Force)