Kellye Burns, space test engineer, left, speaks about the Arnold Engineering Development Complex Space Asset Resilience capability to Gen. David Thompson, vice chief of space operations, U.S. Space Force, during a tour of the Space Threat Assessment Testbed control room at Arnold Air Force Base, Tenn., headquarters of AEDC, Feb. 5, 2021. (U.S. Air Force photo by Jill Pickett)