Airman 1st Class Guillermo Criel, 361st Training Squadron F100 aerospace propulsion student, is a native of Tulsa, Oklahoma, and represents Airmen in the F100 aerospace propulsion training course at Sheppard Air Force Base, Texas, Sept. 19, 2017. Students in this course learn how to trouble shoot, maintain and repair engines to ensure they are in top-notch operational condition.

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