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 visited Arnold to view the test facility and discuss how it will be used to help mature new turbine engine instrumentation. (U.S. Air Force Photo by Deidre Moon)