Photos: A Nation Remembers Sept. 11

A Nation Remembers 9/11
Charles Dharapak / AP

Washington, Sept. 11, 2011
President Barack Obama and First Lady Michelle Obama, Defense Secretary Leon Panetta and Chairman of the Joint Chiefs of Staff Mike Mullen walk an honor-guard cordon en route to laying a wreath during the Pentagon's observation of the 10th anniversary of the Sept. 11 attacks.

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