Secretary of the Air Force Frank Kendall, center, gets an up-close look at a test article in one of the wind tunnels at Arnold Air Force Base, Tenn., during his Oct. 4, 2023, visit. During his time at Arnold, headquarters of Arnold Engineering Development Complex, 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)