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A piece of equipment, called a rake, shown here March, 12, 2020, outfitted with instrumentation will be used by engineers to characterize the air flow in the 16-foot supersonic wind tunnel in the Propulsion Wind Tunnel Facility at Arnold Air Force Base, Tenn., as part of the effort to return the test cell to service. (U.S. Air Force photo by Jill Pickett)
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