Tech. Sgt. Michael Alstrin, 362nd Training Squadron crew chief apprentice course instructor, teaches his students how to perform an oil servicing at Sheppard Air Force Base, Texas, April 10, 2019. It’s a crew chief’s duty to ensure that every component of the aircraft is maintained to the most exacting standards. Alstrin said he has enjoyed his time as an instructor so far. (U.S. Air Force photo by Airman 1st Class Madeleine E. Remillard)