Dr. Ben Carson, Housing and Urban Development secretary, speaks at a 9/11 Memorial Service Sept. 11, 2018, at the Air Mo(bility Command Museum on Dover Air Force Base, Delaware. Carson spoke about the unity among Americans since the terrorist attacks on Sept. 11, 2001, and about how the American people must keep the memory alive for future generations. 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-OK627-1155.JPG