Staff Sgt. Brian Fielhauer and Senior Airman Otto Kelly service the engine of a KC-135 Stratotanker as part of the isochronal inspection process of the aircraft Sept. 14, 2013, at Selfridge Air National Guard Base, Mich. Kelly is a member of the 191st Maintenance Squadron at Selfridge ANGB. During the process, all components of the aircraft undergo an extensive inspection and preventive maintenance. (U.S. Air National Guard photo by Tech. Sgt. Robert Hanet/Released)
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/usairforce/9824479064/">Maintaining the KC-135</a>