Scott Meredith, left, technical advisor for Arnold Engineering Development Complex (AEDC) Flight Systems Branch, talks about the 16-foot supersonic wind tunnel as he, Chief Master Sgt. Stanley Cadell, second from left, command chief, Air Force Materiel Command, and others, walk through the flexible nozzle of the tunnel, July 8, 2020, at Arnold Air Force Base, Tenn., headquarters of AEDC. The visit to the Base by Cadell and Gen. Arnold W. Bunch Jr., commander, Air Force Materiel Command, focused on COVID-19 response and diversity and inclusion. (U.S. Air Force photo by Jill Pickett) (This image has been altered by obscuring a badge for security purposes.)