Start your engines
Aerospace propulsion system specialists from the 148th Fighter Wing, Minnesota Air National Guard, perform post maintenance engine testing on a F110-129 turbofan aircraft engine, Feb. 16, 2023, in Duluth, Minn. 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)