NEWSUnforgettable images from September 2001The Manhattan skyline and the twin towers of the World Trade Center are shown from Jersey City in this March 2000 photo.Mark Lennihan, APUnited Airlines Flight 175 approaches the World Trade Center buildings prior to impact on Sept. 11, 2001.William Kratzke, APSmoke billows from one of the towers of the World Trade Center and flames and debris explode from the second tower.Chao Soi Cheong, APPeople run from the collapse of one of the twin towers of New York's World Trade Center.Suzanne Plunkett, APPresident George W. Bush has his early morning school reading event interrupted by his chief of staff Andrew Card, shortly after the news of a plane hitting one of the World Trade Center buildings in Sarasota, Fla.Paul J. Richards, AFP/Getty ImagesMarcy Borders is covered in dust as she takes refuge in an office building after one of the World Trade Center towers collapsed in New York.Stan Honda, AFP/Getty ImagesTwo women hold each other as they watch the World Trade Center burn.Ernesto Mora, APA police officer and others walk up Park Row from St. Paul's Chapel, a few blocks from the World Trade Center site, shortly after the two towers collapsed.Stan Honda, AFP/Getty ImagesA charred document sits in the soot near the destroyed World Trade Center.Stan Honda, AFP/Getty ImagesMilitary personnel flee from the Pentagon after a plane crashed into the building.H. Darr Beiser, USA TODAYA helicopter flies over the burning Pentagon.Tom Horan, APThe rubble of the World Trade Center smolders Sept. 11, 2001.Alex Fuchs, AFP/Getty ImagesFirefighters gather near the World Trade Center site Sept. 11, 2001.Beth Keiser, APWomen wearing dust masks flee across the Brooklyn Bridge from Manhattan to Brooklyn following the collapse of both World Trade Center towers Sept. 11, 2001.Mark Lennihan, APSmoke fills the air around the World Trade Center in New York City on Sept. 11, 2001.Robert Deutsch, USA TODAYA man stands in the rubble, and calls out asking if anyone needs help, after the collapse of the World Trade Center towers Sept. 11, 2001.Doug Kanter, AFP/Getty ImagesA Pennsylvania State Trooper stands guard at the crash site of United Airlines Flight 93 near Shanksville, Pa., on Sept. 11, 2001.David Maxwell, AFP/Getty ImagesPresident George W. Bush puts his arms around firefighter Bob Beckwith while standing in front of the World Trade Center site Sept. 14, 2001.Doug Mills, APA man looks at photos of people missing in the World Trade Center disaster Sept. 14, 2001.Joe Raedle, Getty ImagesFirefighter Tony James cries while attending the funeral service for New York Fire Department Chaplain Rev. Mychal Judge on Sept. 15, 2001.Joe Raedle, Getty ImagesWith the skyline of New York City as a backdrop, two young men light candles in remembrance of the victims of the Sept. 11 terrorist attacks on Sept. 14, 2001.Henny Ray Abrams, AFP/Getty ImagesBrooklyn firefighters George Johnson, left, of ladder 157, Dan McWilliams, center, of ladder 157, and Billy Eisengrein, right, of Rescue 2, raise a flag at the World Trade Center site in New York.Thomas E. Franklin, The Bergen Record