Jerry Zuk reviews an inspection checklist after removing several tags from an F-117 engine at Joint Base Charleston, S.C., May 3, 2012. Zuk, a retired Air Force crew chief, inspects the engine several times throughout the build-up process. Once the engine is inspected, tested and certified, it is installed on a C-17 Globemaster III. Zuk is a United Airlines F-117 engine inspector. (U.S. Air Force photo/Airman 1st Class Dennis Sloan)