Hydro TO
Tech. Sgt. Alfonso Vigil 92nd Maintenance Squadron hydraulics NCO in charge of dayshift, works on removing the saddle panel from the refueling boom Dec. 16, 2016, at Fairchild Air Force Base, Wash. Changes have been submitted to the KC-135 Stratotanker’s T.O. since the introduction of the aircraft in 1956 to correct errors, all in effort to make it safer for Airmen to maintain and fly the Stratotanker. (U.S. Air Force photo/ Airman 1st Class Sean Campbell)