U.S. Air Force Staff Sgt. Donovan Walters, 18th Component Maintenance Squadron aerospace propulsion craftsman, checks a valve on a F100/220 engine March 10, 2017, at Kadena Air Base, Japan. Whenever a new core is installed, the entire unit goes through a “break-in” process. (U.S. Air Force photo by Airman 1st Class Quay Drawdy)
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