Photos: A Nation Remembers Sept. 11

President Barack Obama and first lady Michelle Obama board Air Force One before their departure from Andrews Air Force Base, Sunday, Sept, 11, 2011.
Jose Luis Magana / AP

Greetings
President Barack Obama and First Lady Michelle Obama are welcomed by Colonel Greg Urtzo, 11th Wing vice commander, and his wife Kelly upon arrival at Andrews Air Force Base on Sunday, Sept. 11, 2011.

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