Airman 1st Class Olajide Adebiyi, above, and Airman 1st Class Jordan Kimble, 364th Training Squadron electrical and environmental systems apprentice course students, work on an F-15 Eagle trainer jet at Sheppard Air Force Base, Texas, Dec. 6, 2018. Adebiyi and Kimble are installing a transformer rectifier. During their courses here they will learn to remove and install the transformer as well as several other components, each with their own unique processes. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)