Airman 1st Class Sean Dugan stands at attention before performing the flag folding ceremony during the 9/11 memorial service Sept. 11, 2013, in the chapel on Offutt Air Force Base, Neb. The memorial service marks the anniversary of the Sept. 11, 2001, terrorist attacks when al-Qaeda operatives hijacked passenger jets and flew them into the Pentagon, World Trade Center towers in New York City and one jet that crashed in Shanksville, Penn. Dugan is assigned to the 55th Aircraft Maintenance Squadron. (U.S. Air Force photo/Charles Haymond)
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