[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-air-force-531X0":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"531X0","air_force","AFSC",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":16,"notes":23},"Machinist","converted",null,"1977-04",[14],{"code":15,"liveCode":11,"name":11},"427X0",[17],{"title":18,"url":19,"accessedAt":20,"sourceDate":21,"locator":22},"Machinist Specialty AFSCs 42730, 42750, 42770, and 42799.","https://archive.org/details/DTIC_ADA073488","2026-07-30","1979-08-01","Internet Archive full-text OCR around char offset 8,025; governing lineage context verified","The surrounding paragraph explicitly describes Machinists; month precision preserved. Verified source wording: “In April 1977, the AFSC was changed from 531X0 to its present AFSC, 427X0.”"]