[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-air-force-531X4":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"531X4","air_force","AFSC",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":16,"notes":23},"Corrosion Control","converted",null,"1977",[14],{"code":15,"liveCode":11,"name":11,"liveBranch":11},"427X1",[17],{"title":18,"url":19,"accessedAt":20,"sourceDate":21,"locator":22},"Corrosion Control, AFSC 427X1","https://archive.org/details/DTIC_ADA196797","2026-07-30","1988-07-01","Internet Archive full-text OCR around char offset 8,942; governing lineage context verified","The report identifies the governing career ladder as Corrosion Control; year precision preserved. A separate upcoming 427X1/427X5 merger was tentative and excluded. Verified source wording: “In 1977, the AFSC was changed from 531X4 to 427X1, with no change in responsibility.”"]