SEYMOUR JOHNSON AIR FORCE BASE - Staff Sgt. Brian Hlywa, an aerospace propulsion specialist, 4th Component Maintenance Squadron, performs a diagnostic check on an uninstalled Pratt and Whitney F-100-PW-220 jet engine, N.C. May 21. The F-100-PW-220 is the engine used in the 4th Fighter Wing?s F-15E Strike Eagles, the Air Force's all-weather, dual role fighter jet. SSgt. Hlywa is responsible for making final inspections on these engines before they are reinstalled into aircraft. (U.S. Air Force photo by Senior Airman Greg C. Biondo)