Mike Bunch, an instrument technician, looks up a part in the digital database created by Gareth Penfold, an instrumentation, data and controls engineer, to track calibration requirements for test, measurement and diagnostic equipment used in the AEDC Aerodynamic and Propulsion Test Unit at Arnold Air Force Base. (U.S. Air Force photo by Jill Pickett) (This image has been altered by obscuring a badge for security purposes.)