[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-army-21B1":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"21B1","army","MOS",[8],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":17,"notes":24},"COMBAT ENGINEER","converted",null,"2010-10-01",[14],{"code":15,"liveCode":15,"name":16},"12B","Combat Engineer",[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. 239","DA Pam 611-21 Table 10-4 maps predecessor MOSC 21B1 to 12B; source successor entries: 12B COMBAT ENGINEER; conversion effective 01 Oct 2010."]