Aerospace Propulsion System specialists from the 148th Fighter Wing, Minnesota Air National Guard, Duluth, Minn., performed post maintenance engine testing on a General Electric F110-129 turbofan aircraft engine on February 16, 2023. Aerospace Propulsion System specialists, also known as jet engine mechanics, remove, install, inspect, repair and modify engines, engine modules and components. (U.S. Air National Guard photo by Audra Flanagan) More