President Barack Obama and first lady Michelle Obama are welcomed by Col. Greg Urtzo, 11th Wing Vice Commander and his wife Kelly upon arrival at Andrews Air Force Base, Sunday, Sept, 11, 2011. Ten years after 9/11 terror attacks, Barack Obama and first lady Michelle Obama are traveling to New York and and Shanksville, Penn., to attend memorial services and then to the Pentagon later in the day.(AP Photo/Jose Luis Magana)
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