Kellye Burns, right, an Arnold Engineering Development Complex (AEDC) space test engineer, briefs Vice Chief of Staff of the Air Force Gen. Stephen Wilson on the Space Threat Assessment Testbed (STAT) during his visit to Arnold Air Force Base, Tenn., Aug. 11, 2020. Wilson visited STAT, arc heaters, the 16-foot Transonic Wind Tunnel and the C-2 engine test cell while at Arnold AFB. (U.S. Air Force photo by Jill Pickett)