130827-F-NS900-901
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/Frank Carter)