Arnold Engineering Development Complex Commander Col. Randel Gordon, left, greets Secretary of the Air Force Frank Kendall upon his arrival at Arnold Air Force Base, Tenn., Oct. 4, 2023. During his visit to Arnold, headquarters of AEDC, Kendall observed some base operations, toured several facilities and received overviews of current and planned AEDC test capabilities. (U.S. Air Force photo by Keith Thornburgh)