GRAND FORKS AIR FORCE BASE, N.D. – Mr. Mark Heitkotter, 319th Maintenance Squadron electronic systems technician, inspects a KC-135 Stratotanker made in 1962 during a periodic inspection here Feb. 27. The decades-old KC-135 undergoes rigorous inspections every 15 months or 1,500 flying hours to make sure it is combat ready. (U.S. Air Force photo/Airman 1st Class Chad Kellum)
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