An honor guard bugler plays taps at the the Pentagon Memorial as the 10th anniversary of the Sept. 11 attacks is observed at the Pentagon outside Washington on Sunday, Sept. 11, 2011. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

An honor guard bugler plays taps at the the Pentagon Memorial as the 10th anniversary of the Sept. 11 attacks is observed at the Pentagon outside Washington on Sunday, Sept. 11, 2011. (AP Photo/Charles Dharapak)