Machinist's Helper
June 1945 is the manual's publication date. No effective date for a change to SSN 431 is given.
- “Machinist's Helper” appears under AR 615-26, September 1942 and supplements; no June 1945 title is listed.
- The suggested alternatives do not establish a fixed split into two successor specialties.
Source extraction notes
Predecessor title from the AR 615-26 column: Machinist's Helper. Suggested conversions/remarks: 114, 302. The table gives no row-level effective date. June 1945 is the manual publication date, not an effective conversion date.
Source documents (1)
Reviewed September 24, 2026 against references 3 and 4.
- Manual of Military Occupational Specialties, NAVMC 1008-PD, June 1945, Appendix B
1. Appendix B, printed p. 241 / PDF image p. 247, SSN 431
PDF page 247 (opens in a new tab)2.Manual of Military Occupational Specialties, NAVMC 1008-PD, June 1945, Appendix B · event transcription · docs/legacy-data/usmc-wartime-ssn.jsonl:169; Appendix B, printed p. 241 / PDF image p. 247, SSN 431
PDF page 247 (opens in a new tab)3.NAVMC 1008-PD: Appendix B primary row 431 · Printed p. 241 / PDF p. 247, SSN 431; five-column primary image transcription · cited by the explanation
PDF page 247 (opens in a new tab)4.NAVMC 1008-PD: governing rules for deleted and changed SSNs · Chapter I section 13(2), printed p. 9 / PDF p. 15, and Appendix B heading, printed p. 236 / PDF p. 242 · cited by the explanation
PDF page 15 (opens in a new tab)PDF page 242 (opens in a new tab)