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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 to Arnold Air Force Base, Tenn., June 18, 2020. 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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