Airman 1st Class Dallas Gullion, 436th Civil Engineer Squadron fire fighter, places a folded American flag on the memorial altar at the dedication ceremony of the Sept. 11 Memorial, Sept. 11, 2013,at the Air Mobility Command Museum on Dover Air Force Base, Del. The memorial, which incorporates two pieces of steel from World Trade Center tower one, a rock from the United Airlines Flight 93 crash site and a block from the damaged portion of the Pentagon, was unveiled at the ceremony. (U.S. Air Force photo/David S. Tucker)
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