Marine Corps · SSN history

693 Instrument Observer

Appendix B identifies the earlier SSN 693 as Instrument Observer and marks it “None,” indicating no Marine Corps specialty and deletion for Marine Corps use. No successor specialty is specified.

Documented history

Instrument Observer

June 1945 is the manual’s publication date; the entry gives no effective date for the deletion.

  • This does not establish that the Army occupation was abolished.
Source extraction notes

Predecessor title from the AR 615-26 column: Instrument Observer. Suggested conversions/remarks, as printed: None. None means no Marine Corps specialty is identified for this earlier meaning; it does not establish that the Army occupation was abolished. The table gives no row-level calendar effective date. June 1945 is the manual publication date, not an inferred individual 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.