Airman 1st Class Rylee Johnson, front, and Airman 1st Class Jeremy Barnes, 361st Training Squadron aerospace apprentice course students, work on a T-56 turboprop engine at Sheppard Air Force Base, Texas, July 18, 2019. Barnes and Johnson are removing and re-installing a reduction gearbox. The gearbox reduces the engines RPM from 13820 to 1020, as the engine is a jet engine modified to have a propeller attached. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)