Marine Corps · SSN history

551 Control Board Operator

SSN 551, identified as Control Board Operator in AR 615-26 (September 1942 and supplements), was deleted for Marine Corps use. Appendix B lists no June 1945 title and marks it “None,” meaning no Marine Corps specialty, without naming a successor.

Documented history

Control Board Operator

June 1945 is the manual’s publication date. No effective date is given for the deletion.

  • Any replacement classification required review of the individual’s qualifications against the manual’s job specifications, not an automatic conversion.
Source extraction notes

Predecessor title from the AR 615-26 column: Control Board Operator. Suggested conversions/remarks: None. 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.

Historical information is drawn from the sources linked above. Classification dates are not personal service dates. Spot an error? Let us know.