Airmen Brandinn Kim and Elizabeth Ulring heat a No.1 bearing housing on the F-110 engine before installing a rotating air seal Aug. 27, 2013, at Sheppard Air Force Base, Texas. The engine is from an F-15 Eagle. Kim and Ulring are assigned to the 361st Training Squadron Jet Propulsion course. (U.S. Air Force photo by Frank Carter/Released)
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/usairforce/9689170982/">Propulsion Training</a>