Tech. Sgt. Gregory Sharpe, on chair, 362nd Training Squadron F-16 crew chief apprentice course instructor, talks to Airman 1st Class Charles McRae, left, and Airman Michael Teems, 362nd TRS F-16 crew chief apprentice course students, during their class at Sheppard Air Force Base, Texas, Aug. 22, 2018. The students are servicing the hydraulic fluid of the jet, which is vital to controlling everything from the jet's brakes and landing gear to it's guns and more. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)