President Barack Obama and first lady Michelle Obama walk at permanent Flight 93 National Memorial after laying a wreath at the Wall of Names near the crash site of Flight 93 in Shanksville, Pa. Sunday Sept. 11, 2011, on the 10th anniversary of the Sept. 11 terrorist attacks. (AP Photo/Gene J. Puskar)

Associated Press
President Barack Obama and first lady Michelle Obama walk at permanent Flight 93 National Memorial after laying a wreath at the Wall of Names near the crash site of Flight 93 in Shanksville, Pa. Sunday Sept. 11, 2011, on the 10th anniversary of the Sept. 11 terrorist attacks. (AP Photo/Gene J. Puskar)
President Barack Obama and first lady Michelle Obama walk at permanent Flight 93 National Memorial after laying a wreath at the Wall of Names near the crash site of Flight 93 in Shanksville, Pa. Sunday Sept. 11, 2011, on the 10th anniversary of the Sept. 11 terrorist attacks. (AP Photo/Gene J. Puskar)
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