[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"legacy-detail-army-0521":3},{"code":4,"branch":5,"codeSystem":6,"events":7},"0521","army","SSN",[8,27],{"title":9,"status":10,"effectiveFrom":11,"effectiveTo":12,"successors":13,"citations":16,"notes":26},"Basic","converted",null,"1950-02-01",[14],{"code":15,"liveCode":11,"name":11},"5729",[17,23],{"title":18,"url":19,"accessedAt":20,"sourceDate":21,"locator":22},"SR 650-205-1, Career Guidance: Combat Construction Ladder, 7 November 1949","https://books.google.com/books?id=MHvXEh02xs0C&pg=PA2","2026-07-30","1949-11-07","printed p. 2, paragraphs 4a and 5a: T/O&E amendments effective 7 Nov 1949; incumbent primary/potential-primary MOS conversion effective 1 Feb 1950",{"title":18,"url":24,"accessedAt":20,"sourceDate":21,"locator":25},"https://books.google.com/books?id=MHvXEh02xs0C&pg=PA15","printed p. 15, T/O&E change sheet; present SSN 0521 position row(s) to new SSN 5729","The instrument prints no field-wide rescinded-code list; only its explicit appendix T/O&E position conversions are asserted here. Basic/filler-personnel positions convert to pioneer MOS 5729. The 4 position-level source assertion(s) are collapsed into this one canonical predecessor event, preserving first-source successor order. Personnel MOS conversion is effective 1 February 1950; the appendix's T/O&E position amendments took effect 7 November 1949. The predecessor remains in the SSN namespace; successors are numeric MOS codes.",{"title":28,"status":29,"effectiveFrom":11,"effectiveTo":30,"successors":31,"citations":36,"notes":50},"Soldier","split","1949-04-29",[32,34],{"code":33,"liveCode":11,"name":11},"4745",{"code":35,"liveCode":11,"name":11},"4812",[37,41,44,47],{"title":38,"url":39,"accessedAt":20,"sourceDate":30,"locator":40},"SR 650-207-1, Career Guidance: Infantry Career Field, 29 April 1949","https://books.google.com/books?id=77RxEy6oYR0C&pg=PA19","printed p. 19, paragraph 6 restricted-use conversion for 0521 Soldier",{"title":38,"url":42,"accessedAt":20,"sourceDate":30,"locator":43},"https://books.google.com/books?id=77RxEy6oYR0C&pg=PA22","printed p. 22, paragraph 8a: appendix T/O&E conversions effective on the date of the regulation",{"title":38,"url":45,"accessedAt":20,"sourceDate":30,"locator":46},"https://books.google.com/books?id=77RxEy6oYR0C&pg=PA31","printed p. 31, T/O&E change sheet; 0521 position row(s) to 4745",{"title":38,"url":48,"accessedAt":20,"sourceDate":30,"locator":49},"https://books.google.com/books?id=77RxEy6oYR0C&pg=PA35","printed p. 35, T/O&E change sheet; 0521 position row(s) to 4812","Paragraph 6 restricts this SSN in Infantry use but does not rescind it Army-wide. Paragraph 6 directs former ammunition-bearer/filler use to 4745 for light-weapons positions or 4812 for heavy-weapons positions. Repeated position-level change-sheet rows are collapsed into this one canonical predecessor event, preserving first-source successor order. The predecessor remains in the SSN namespace; successors are numeric MOS codes."]