ELLSWORTH AIR FORCE BASE, S.D. -- Airman 1st Class Justin Hildreth, 28th Maintenance Squadron aerospace propulsion maintenance apprentice, places bolts in the upper-outer fan duct of a B-1B Lancer engine, Feb. 3. Carrying the largest payload of both guided and unguided weapons in the Air Force inventory, the multimission B-1 is the backbone of America's long-range bomber force. (U.S Air Force photo/Airman 1st Class Anthony Sanchelli)
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