[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-air-force-531X1":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"531X1","air_force","AFSC",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":16,"notes":23},"Metals Processing","converted",null,"1977-04",[14],{"code":15,"liveCode":11,"name":11},"427X4",[17],{"title":18,"url":19,"accessedAt":20,"sourceDate":21,"locator":22},"Metals Processing Career Ladder, AFSC 427X4.","https://archive.org/details/DTIC_ADA158602","2026-07-30","1985-08-01","Internet Archive full-text OCR around char offset 7,310; governing lineage context verified","Second directional code change in the source-stated career-ladder sequence; obvious OCR '19771' normalized to 1977. Verified source wording: “Originally established as AFS 532X0 in 1951, the Metals Processing career ladder AFSC was changed to 531X1 in 1975, and received the current designation of 427X4 in April 1977.”"]