GRAND FORKS AIR FORCE BASE, N.D. – Staff Sgt. Brian O’Day, 319th Maintenance Squadron, cross references a part with reference material during a periodic inspection here, Feb. 27. Every KC-135 goes through periodic inspections every 15 months or 1,500 flight hours. Sergeant O’Day and more than 50 other maintenance Airmen inspect and repair nearly every system within five to eight days. (U.S. Air Force photo/Airman 1st Class Chad Kellum)
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