Vice President Joe Biden and Dr. Jill Biden at the newly unveiled Flight 93 National Memorial in Shanksville, Pennsylvania

Vice President Joe Biden and Dr. Jill Biden walk past the newly unveiled Flight 93 National Memorial in Shanksville, Pennsylvania, September 10, 2011. Also pictured are President George W. Bush and Laura Bush, President Bill Clinton, Secretary Ken Salazar, and Jon Jarvis, Director of the National Park Service.