ARNOLD AIR FORCE BASE, Tenn. --   Gen. Duke Z. Richardson, commander of Air Force Materiel Command, left, speaks with Lt. Col. Joseph Sabat, 716th Test Squadron commander, right, outside of the Propulsion Wind Tunnel Facility lobby at Arnold Air Force Base, Tenn., April 24, 2025. Also pictured is Chief Master Sgt. Bill Fitch, AFMC Command Chief Master Sergeant, center. Richardson visited Arnold AFB, headquarters of Arnold Engineering Development Complex, headquarters of AEDC, to tour several test facilities, meet with personnel, and receive updates on various programs and projects. (U.S. Air Force photo by Keith Thornburgh) (This image was altered by obscuring badges for security purposes)