Under Secretary of Defense for Research and Engineering visits Arnold AFB
Heidi Shyu, Under Secretary of Defense for Research and Engineering, is greeted by Maj. Justin Ong, deputy director of the Hypersonic Systems Test Branch, and other installation personnel and leadership as she arrives for her Dec. 11, 2023, visit to Arnold Air Force Base, Tenn. During her visit to Arnold, headquarters of Arnold Engineering Development Complex, Shyu toured several test facilities and was briefed on test capabilities at Arnold. (U.S. Air Force photo by Keith Thornburgh)