Firefighters help fold the National 9/11 Flag as it is transferred into the National Sept. 11 Memorial Museum's permanent collection on May 21 in New York City. The giant American flag, which was flying from a building beside the World Trade Center on September 11, 2001 and was later found badly damaged in the debris of ground zero, was unfurled at the World Trade Center site in a ceremony.Spencer Platt / Getty Images
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