Members from the Dover Air Force Base Honor Guard march during a 9/11 Memorial Service Sept. 11, 2018, at the Air Mobility Command Museum on Dover AFB, Delaware. The annual memorial service honors the civilian casualties of the terrorist attack as well as the police officers, firefighters and emergency first responders who lost their lives attempting to save them. (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-OK627-1083.JPG