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130914-Z-NJ721-024 – Staff Sgt. Brian Fielhauer and Senior Airman Otto Kelly service the engine of a KC-135 Stratotanker as part of the the isochronal inspection process of the aircraft at Selfridge Air National Guard Base, Mich., Sept. 14, 2013. Kelly is a member of the 191st Maintenance Squadron at Selfridge. During the ISO inspection process, all components of the aircraft undergo an extensive inspection and preventive maintenance process. (U.S. Air National Guard photo by TSgt. Robert Hanet/Released)
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