Pictures Remembering 9/11 Attacks September 11, 2011 / 4:35 PM CDT / CBS News (credit: Brendan Hoffman/Getty Images) United Flight 93 Memorial In Shanksville, Pa. (credit: NICHOLAS KAMM/AFP/Getty Images) United Flight 93 Memorial In Shanksville, Pa. (credit: NICHOLAS KAMM/AFP/Getty Images) United Flight 93 Memorial In Shanksville, Pa. (credit: NICHOLAS KAMM/AFP/Getty Images) United Flight 93 Memorial In Shanksville, Pa. (credit: NICHOLAS KAMM/AFP/Getty Images) Vice President Biden And Former President Bush Attend Flight 93 National Memorial Dedication (credit: Jeff Swensen/Getty Images) Vice President Biden And Former President Bush Attend Flight 93 National Memorial Dedication (credit: Jeff Swensen/Getty Images) Vice President Biden And Former President Bush Attend Flight 93 National Memorial Dedication (credit: Jeff Swensen/Getty Images) United Flight 93 Memorial In Shanksville, Pa. (credit: NICHOLAS KAMM/AFP/Getty Images) Washington DC Observes 10th Anniversary Of September 11 Attacks (credit: Mark Wilson/Getty Images) Anniversary Of Sept. 11th Attacks Marked At Pentagon (credit: Win McNamee/Getty Images) Anniversary Of Sept. 11th Attacks Marked At Pentagon (credit: PAUL J. RICHARDS/AFP/Getty Images) Anniversary of Sept. 11th Attacks Marked At Pentagon (credit: Brendan Smialowski/Getty Images) Anniversary of Sept. 11th Attacks Marked At Pentagon (credit: Brendan Smialowski/Getty Images) Anniversary Of Sept. 11th Attacks Marked At Pentagon (credit: Win McNamee/Getty Images) Anniversary Of Sept. 11th Attacks Marked At Pentagon (credit: Win McNamee/Getty Images) New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks (credit: Aaron Showalter/Getty Images) New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks (credit: Seth Wenig/Getty Images) President Barack Obama and First Lady In Shanksville, Pa. (credit: MANDEL NGAN/AFP/Getty Images) President Barack Obama In Shanksville, Pa. (credit: MANDEL NGAN/AFP/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Chip Somodevilla/Getty Images) New York City Fire Fighters Commemorate 10th Anniversary Of Sept. 11th Attacks (credit: Mario Tama/Getty Images) President Barack Obama Lays Wreath In Shanksville, Pa. (credit: MANDEL NGAN/AFP/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Lucas Jackson/Getty Images) President Barack Obama and First Lady At Flight 93 National Memorial (credit: MANDEL NGAN/AFP/Getty Images) New York City Commemorates 10th Anniversary Of 9-11 Terror Attacks (credit: Lucas Jackson/Getty Images) New York City Fire Fighters Commemorate 10th Anniversary Of Sept. 11th Attacks (credit: Justin Sullivan/Getty Images) New York City Fire Fighters Commemorate 10th Anniversary Of Sept. 11th Attacks (credit: Justin Sullivan/Getty Images) Former President George W. Bush Speaks At Flight 93 Memorial (credit: NICHOLAS KAMM/AFP/Getty Images) Anniversary Of Sept. 11th Attacks Marked At Pentagon (credit: Brendan Hoffman/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Carolyn Cole/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Seth Wenig/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Chip Somodevilla/Getty Images New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Andrew Burton/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Carolyn Cole/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Spencer Platt/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Justin Lane/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Spencer Platt/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Justin Lane/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Chip Somodevilla/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Chip Somodevilla/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Carolyn Cole/Getty Images) New York City Commemorates 10th Anniversary of 9/11 Terror Attacks (credit: Daniel Berehulak/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Seth Wenig/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Robert Deutsch/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Justin Lane/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Justin Lane/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Justin Lane/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Justin Lane/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Lucas Jackson/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Allan Tannenbaum/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Lucas Jackson/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Allan Tannenbaum/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Spencer Platt/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Spencer Platt/Getty Images) New York City Commemorates 10th Anniversary Of 9/11 Terror Attacks (credit: Todd Heisler/Getty Images)