Staff Sgt. Eric Barney, 22nd Maintenance Squadron jet instructor, instructs Airman 1st Class Kristopher Dooley, 22nd MXS hydraulics apprentice, on the mechanics of a turbofan engine Sept. 10, 2012, McConnell Air Force Base, Kansas. Each of McConnell’s KC-135 Stratotankers has four turbofan engines that allow it to reach speeds more than 550 mph. (U.S. Air Force photo/Airman 1st Class Maurice A. Hodges)
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