Rep. John Rose, of Tennessee, listens to Lt. Col. Lane Haubelt, chief of the Propulsion Test Branch, Test Division, Arnold Engineering Development Complex (AEDC), speak about the engine test capabilities the branch operates during the representative's visit to Arnold Air Force Base, Tenn., headquarters of AEDC, Aug. 31, 2021. Rose toured Sea Level Test Cell 3, which is currently being used to support accelerated mission testing of an F135, the engine model that powers the F-35 Joint Strike Fighter. (U.S. Air Force photo by Jill Pickett)