A group of aerospace propulsion Airmen from the 28th Aircraft Maintenance Squadron gather to fix a piece of a B-1B Lancer engine on the flight line at Ellsworth Air Force Base, S.D., Dec. 4, 2018. Commonly known as jet engine mechanics, these Airmen are tasked with maintaining, repairing and testing all parts of the engines to ensure they are operational. (U.S. Air Force photo by Senior Airman Denise Jenson)