[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-air-force-566X1":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"566X1","air_force","AFSC",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":17,"notes":24},"Environmental Support","merged",null,"1992-10",[14],{"code":15,"liveCode":15,"name":16},"3E4X1","Water and Fuel Systems Maintenance",[18],{"title":19,"url":20,"accessedAt":21,"sourceDate":22,"locator":23},"Utilities Systems. AFSC 3E4X1.","https://archive.org/details/DTIC_ADA305731","2026-07-30","1996-02-01","Internet Archive full-text OCR around char offset 9,216; governing lineage context verified","One row per changing predecessor in the explicit two-to-one merger; source pattern preserved. Verified source wording: “In October 1992, the 552X5 (Plumbing), and the 566X1 (Environmental Support) merged to form the present 3E4X1 Utilities System career field.”"]