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Adam Gilliland, an aerospace machinist, works on a standard test model in the area below the test cell of Tunnel C in the von Kármán Gas Dynamics Facility at Arnold Air Force Base, Tenn., Dec. 7, 2021. When testing, the model is raised into the test section with the tunnel in operation. (U.S. Air Force photos by Jill Pickett)
24.0-70.0 mm f/2.8
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