Marine Corps · SSN history

100 Structural Steel Worker

Appendix B identifies SSN 100 as Structural Steel Worker under AR 615-26 of September 1942 and its supplements, and lists SSN 190 as a suggested conversion. This was not an automatic replacement: each affected Marine’s Qualification Card had to be reviewed against the job specifications before a suitable classification was assigned.

Codes named in this history

Codes without a directory match

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

Documented history

Structural Steel Worker

June 1945 is the manual’s publication date, not an effective conversion date. The entry gives no date for a classification change.

  • The June 1945 Present Title is blank; the entry does not establish a specific cancellation, rename, or completed conversion to SSN 190.
Source extraction notes

Predecessor title from the AR 615-26 column: Structural Steel Worker. Suggested conversions/remarks: 190. 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.