Airman Hunter Allison, 364th Training Squadron fuels apprentice course student, sets up an additive injector to receive and transfer fuel at Sheppard Air Force Base, Texas, Feb. 21, 2019. A fuels specialist must be proficient with this task because in many deployed locations, both the aircraft and the base are dependent on fuels systems set up by fuels specialists. (U.S. Air Force photo by Airman Madeleine E. Remillard)