Standing in front of the F404 engine, Bernie Williamson, Aeropropulsion technology lead for the Test Systems Branch, speaks to members of the Propulsion Instrumentation Working Group in the Arnold Engineering Development Complex Sea Level 1 engine test cell at Arnold Air Force Base, Tenn., Oct. 28, 2020. The PIWG members visited Arnold to view the test facility and discuss how the test stand will be used to help mature new turbine engine instrumentation. (U.S. Air Force Photo by Deidre Moon) (This image has been altered by obscuring a badge for security purposes.)