Bernie Williamson, right, the Aeropropulsion technology lead for the Test Systems Branch, speaks to Tom Serbowicz, co-chair of the Propulsion Instrumentation Working Group, Oct. 28, 2020, about how the F404 engine testbed in the Arnold Engineering Development Complex Sea Level 1 engine test cell at Arnold Air Force Base, Tenn., will be used in maturing new turbine engine instrumentation. (U.S. Air Force Photo by Deidre Moon)