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The infrastructure seen here is all that remained of Tunnel E at the von Kármán Gas Dynamic Facility on Arnold Air Force Base, Tenn., prior to the start of its demolition in early 2022. Absent are the critical Mach 8 nozzle and test section components, as well as the unique magnetic model support system. Operational beginning in 1959, Tunnel E was a pilot facility for Tunnels B and C, which are still active wind tunnel test facilities today. (U.S. Air Force photos)
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