[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-army-54B1":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"54B1","army","MOS",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":17,"notes":24},"CHEMICAL OPERATIONS SPECIALIST","converted",null,"2004-09-01",[14],{"code":15,"liveCode":15,"name":16},"74D","Chemical, Biological, Radiological, and Nuclear (CBRN) Specialist",[18],{"title":19,"url":20,"accessedAt":21,"sourceDate":22,"locator":23},"DA Pam 611-21, chapter 10, Table 10-4, Enlisted MOS Conversion Listing","https://api.army.mil/e2/c/downloads/2025/12/04/7573670f/chapter-10-enlisted-base-chapter.pdf","2026-07-29","2025","Table 10-4, PDF p. 269","DA Pam 611-21 Table 10-4 maps predecessor MOSC 54B1 to 74D; source successor entries: 74D CHEMICAL, BIOLOGICAL, RADIOLOGICAL AND NUCLEAR (CBRN) SPECIALIST; conversion effective 01 Sep 2004."]