Machinist's Mate (S) (Shop Machinist's) · Merged into MR, effective 1948
Malin/BUPERS source assertion: Established 1948 from the ratings of Machinist's Mate (S) (Shop Machinist's) and Machinist's Mate (SR) (Outside Machinists). Normalized as merged/included. One or more historical long-title variants were normalized to a reviewed companion-list abbreviation by similarity match; the intermediate ledger records the method and the audit lists the source anomalies.
Sources
- Charles A. Malin/Bureau of Naval Personnel, Compilation of Enlisted Ratings and Apprenticeships, U.S. Navy, 1775 to 1969 (rev. Dec. 1969) (#anchorm, Machinery Repairman entry; reproduced on archived Ohio PDF p. 9)
- Charles A. Malin/Bureau of Naval Personnel, Abbreviations Used for Navy Enlisted Ratings (1970) (alphabetic abbreviation list, MMS, MR entries)