Photo Gallery: Sept. 11 Anniversary 29/33

First responders hold the National September 11 flag during a ceremony in Joplin, Mo., Sunday, Sept. 11, 2011 marking the end of the 50 state restoration tour. The final stitches are being placed in Joplin and then the flag will go to the National 9/11 Memorial Museum. (AP Photo/Paul Sancya)