Marine Corps · SSN history

721 Panel and Code Operator

Appendix B lists SSN 721, Panel and Code Operator, under AR 615-26 of September 1942 and its supplements, with SSN 667 as a suggested conversion. That suggestion required individual qualification review, not automatic conversion to 667.

Codes named in this history

Codes without a directory match

  • 667 stated by the source. No directory or archive record matches.

Documented history

Panel and Code Operator

June 1945 is the manual’s publication date; no effective date for this suggested conversion is given.

  • No title is listed for SSN 721 in either the June 1944 tentative-title column or the June 1945 Present Title column.
  • The entry does not establish a fixed replacement or specify whether SSN 721 was deleted or fundamentally changed.
Source extraction notes

Predecessor title from the AR 615-26 column: Panel and Code Operator. Suggested conversions/remarks: 667. 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.