caption: Staff <PERSON>. <PERSON>, a crew chief assigned to the 28th Aircraft Maintenance Squadron, taxies an aircraft into a spot on the flight line at Ellsworth Air Force Base, S.D., Dec. 4, 2018. Crew chiefs are responsible for the <PERSON>' day-to-day maintenance including post flight and preflight inspections. (U.S. Air Force photo by Senior Airman <PERSON>)