Staff Sgt. David Atteberry, an aircraft hydraulic systems technician assigned to the 92nd Aircraft Maintenance Squadron, Fairchild Air Force Base, Wash., takes a moment to look over his work after replacing a KC-135 Stratotanker’s hydraulic system relief valve that covered him in hydraulic fluid during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Aircraft hydraulic system specialists are responsible for everything that deals with hydraulic and pneumatic systems, including landing gears, brakes, flight controls, weapons and cargo door systems. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)