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Maj. Christopher Brunelle, director of operations for the Arnold Engineering Development Complex Space and Missile Branch, explains the construction of an arc heater to Secretary of the Air Force Barbara Barrett during her visit, June 18, 2020, to Arnold Air Force Base, Tenn. Arc heaters provide high-enthalpy test environments to test materials and other means of thermal protection. (U.S. Air Force photo by Jill Pickett)

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Photo by: Jill Pickett |  VIRIN: 200618-F-KN521-0054.JPG