Hope and heroism: Obama hails post-9/11 resilience - Article Photos 18/28

President Barack Obama, far right, speaks as, from left, former First Lady Laura Bush, former President George W. Bush and First Lady Michelle Obama look on as friends and relatives of the victims of 9/11 gather for a ceremony marking the 10th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Jason DeCrow)