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Tech Sgt. Sean Preston, 433rd Maintenance Squadron aerospace propulsion technician, shows off a C-5M jet engine to members of the Anti-Aircraft Artillery Officer Candidate School Oct. 4, 2017 at Joint Base San Antonio-Lackland, Texas. The tour also included a walk-through of a C-5M Super Galaxy aircraft and the wing's sheet metal shop. The AAAOCS celebrates the 1953 training class annually, with many of their members serving during the Korean War.
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