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. These students are performing their last tasks at Sheppard, as they will graduate next Monday. At Sheppard they will only learn the more basic mechanical aspects before going off to their next base for additional training. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)