Maj. Gen. Christopher Azzano, left, commander, Air Force Test Center, comments to Lt. Col. John McShane, right, chief of the Flight Systems Branch, Test Division, Arnold Engineering Development Complex, as they look at the test section of Tunnel B in the von Kármán Gas Dynamics Facility, Nov. 10, 2020, at Arnold Air Force Base, Tenn. Also pictured is Chief Master Sgt. Brian Stafford, Command Chief Master Sgt. of the Air Force Test Center. The wind tunnel is used to conduct aerodynamic testing at hypersonic speeds. (U.S. Air Force photo by Jill Pickett)