Question: Who operates the testing facility at Arnold Air Force Base in Tennessee?
Sentence (from "Propulsion Wind Tunnel Facility"): The Propulsion Wind Tunnel Facility, located at Arnold Engineering Development Complex, Arnold Air Force Base, Tennessee, holds three wind tunnels: the 16-foot transonic (16T), 16-foot supersonic (16S), and the aerodynamic 4-foot transonic (4T) tunnels.
Relevant evidence: No