4 of 54: First Sgt. Robert Baranik plays Taps following a ceremony to commemmorate the 10th anniversary of the Sept. 11, 2001 terrorist attacks, on a hill above phase 1 of the permanent Flight 93 National Memorial near the crash site of Flight 93 in Shanksville, Pa. Sunday Sept. 11, 2011. The crash site of United Flight 93 is marked by the large rock in the distance. ((AP Photo/Amy Sancetta))

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