[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-air-force-424X0":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"424X0","air_force","AFSC",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":16,"notes":23},"Aircraft Fuel Systems","converted",null,"1976",[14],{"code":15,"liveCode":11,"name":11},"423X3",[17],{"title":18,"url":19,"accessedAt":20,"sourceDate":21,"locator":22},"Aircraft Fuel Systems Career Ladder.","https://archive.org/details/DTIC_ADA161904","2026-07-30","1985-09-01","Internet Archive full-text OCR around char offset 6,988; governing lineage context verified","Second directional code change in the source-stated career-ladder sequence; year precision preserved. Verified source wording: “In 1961, the AFSC was changed to 424X0. In 1976, it was again changed to 423X3.”"]