Engine Test Operator
June 1945 is the manual’s publication date. No effective date is given for the suggested conversion from SSN 520 to SSN 684.
- No title is listed for SSN 520 in either the June 1944 tentative-title column or the June 1945 Present Title column.
- The entry does not establish that any particular Marine was reclassified to SSN 684.
Source extraction notes
Predecessor title from the AR 615-26 column: Engine Test Operator. Suggested conversions/remarks: 684. 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. 243 / PDF image p. 249, SSN 520
PDF page 249 (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:217; Appendix B, printed p. 243 / PDF image p. 249, SSN 520
PDF page 249 (opens in a new tab)3.NAVMC 1008-PD: Appendix B primary row 520 · Printed p. 243 / PDF p. 249, SSN 520; five-column primary image transcription · cited by the explanation
PDF page 249 (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)