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Kellye Burns, center, a space test engineer, explains to Secretary of the Air Force Barbara Barrett a materials test that was conducted in the Space Threat Assessment Testbed to understand the performance of the materials in and susceptibility to a realistic space environment at Arnold Air Force Base, Tenn., June 18, 2020. (U.S. Air Force photo by Jill Pickett)

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Photo by: Jill Pickett |  VIRIN: 200618-F-KN521-0028.JPG