ELLSWORTH AIR FORCE BASE, S.D. – (From left) Airmen 1st Class Jesse Davis, Benjamen Lundy and Jonathan Bettenhausen, 28th Maintenance Squadron aerospace propulsion technicians, tighten bolts on a B-1B Lancer engine, March 25. The B-1 engines are inspected after every 100 hours of flying. (U.S. Air Force photo/Senior Airman Marc I. Lane)
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