Airman 1st Class Johnny Patterson, left, 58th Aircraft Maintenance Squadron F-35 Lightning II crew chief, talks to Col. Charles Wallace II, 33rd Fighter Wing F-35 Academic Training Center director and F-35 pilot, after completing his first sortie in the aircraft on Eglin Air Force Base, Fla., Dec. 5, 2014. Patterson was in the first class of pipeline students qualified as F-35 Lightning II crew chiefs. While other crew chiefs on the flight line cross-trained from fourth-generation weapon systems, Patterson’s class has only ever worked with the F-35. (U.S. Air Force photo/Staff Sgt. Marleah Robertson)