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Outside the north wall of the Tunnel E test bay, the upstream end of a large electric resistance heater formerly housed its electrical connects to the Heater Control Building. This pipe and the associated electrical wiring was removed as part of dismantling the tunnel at Arnold Air Force Base, Tenn., March 4, 2022. (U.S. Air Force photo by Jill Pickett)
24.0-70.0 mm f/2.8
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