William Caiola and Adam Fluharty, members of Carlisle Fire Company in Milford, Delaware, perform a bell-ringing ceremony during a 9/11 Memorial Service Sept. 11, 2018, at the Air Mobility Command Museum on Dover Air Force Base. The bell-ringing ceremony is a firefighter tradition that announces the death of a firefighter and commemorates their sacrifice. (U.S. Air Force photo by Airman 1st Class Zoe M. Wockenfuss)

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Photo by: Airman 1st Class Zoe Wockenfuss |  VIRIN: 180911-F-OK627-1215.JPG