U.S. Air Force Staff Sgt. Wilvan Tan, left, 100th Aircraft Maintenance Squadron electrical environmental technician, and U.S. Air Force Master Sgt. Brian Flanders, 100th AMXS production superintendent, look through KC-135 Stratotanker maintenance forms Oct. 29, 2015, at Son San Juan Air Base, Spain. Tan was replacing a gear-retraction piece. (U.S. Air Force photo by Senior Airman Christine Halan/Released)