Airman 1st Class Sarah Spahn, 361st Training Squadron aerospace propulsion apprentice course student, removes and installs an augmenter and exhaust nozzle of an engine trainer at Sheppard Air Force Base, Texas, April 3, 2019. An augmenter can augment an engine's thrust by 50%, while the exhaust nozzle regulates and controls the back pressure to decrease stall margins. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)