Breaking in the core
U.S. Air Force Staff Sgt. Stephen Baudo, 18th Component Maintenance Squadron aerospace propulsion craftsman, checks spacing on an engine blade March 10, 2017, at Kadena Air Base, Japan. When installing new cores into an existing unit, the entire engine goes through a rigorous series of checks and tests before being declared mission ready. (U.S. Air Force photo by Airman 1st Class Quay Drawdy)