David Knauer, left, and Brad Bianchi look at a jet engine at the 361st Training Squadron's Jet Engine Mishap Investigation Course that was destroyed by a bird years ago. Mr. Knauer, a course instructor, and other teach the nine-day course to help develop investigative techniques to those who could potentially be part of an accident investigation board. Mr. Bianchi is a quality assurance inspecter for the 75th Propulsion Maintenance Group at Tinker Air Force Base, Okla. (U.S. Air Force photo/John Ingle)
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