Capt. Michael Herbert, a test manager in the Arnold Engineering Development Complex Aerodynamics Test Branch at Arnold Air Force Base, right, describes 4-foot transonic wind tunnel operations, March 19, 2021, to cadets with Air Force ROTC Detachment 290 from the University of Kentucky. The cadets, pictured from left, are Dillyn Twisdale, Andrew Kauffman, Olivia Liddle and Dominick Herbert. (U.S. Air Force photo by Bradley Hicks) (This image was altered by obscuring badges for security purposes.)