Jeff Albro, left, the Joint Strike Fighter Joint Program Office F135 Ground Test and Evaluation manager, briefs Rep. John Rose, right, of Tennessee, about the testing of the F135 currently being conducted using the Sea Level Test Cell 3 (SL-3) as Rose tours the facility during his visit Aug. 31, 2021, to Arnold Air Force Base, Tenn., headquarters of Arnold Engineering Development Complex. The F135 is the engine that powers the F-35 Joint Strike Fighter. Also pictured is Lt. Col. Lane Haubelt, chief of the Propulsion Test Branch, Test Division, AEDC. (U.S. Air Force photo by Jill Pickett)