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Tim Gilliam, left, Arnold Engineering Development Complex machinist, and Mark Carson, an AEDC lead machinist, move a 3.3-inch barrel section in the Hyper-ballistic Range G Feb. 23, 2021, at Arnold Air Force Base, Tenn. The section is being swapped out with an 8-inch barrel for a test. (U.S. Air Force photo by Jill Pickett)
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