Airmen from the 28th Aircraft Maintenance Squadron’s aircraft hydraulic system shop work on a B-1B Lancer inside a hangar at Ellsworth Air Force Base, S.D., Dec. 4, 2018. These Airmen are responsible for ensuring the hydraulic and pneumatic systems are in working order, and they maintain and repair items like the landing gear, brakes and flight controls. (U.S. Air Force photo by Senior Airman Denise Jenson)