Crews control
Crew chiefs with the 5th Aircraft Maintenance Squadron work together to open a hangar door at Minot Air Force Base, N.D., Dec. 8, 2017. A crew chief’s job includes performing detailed inspections, servicing, pre-flight recovery, launches and landings in addition to many other duties. (U.S. Air Force photo by Airman 1st Class Alyssa M. Akers)