Machinist's Mate (CB) (Equipment Operators)
The history dates the establishment of both successor ratings to 1948 but gives no month or day.
- The history does not specify how sailors were assigned between the two successor ratings.
Source extraction notes
Malin/BUPERS source assertion: Established 1948 from the rating of Machinist's Mate (CB) (Equipment Operators). | Established 1948 from the ratings of Machinist's Mate (CB) (Equipment Operators) and Motor Machinist's Mate. Normalized as split/multi-destination. Reconciles 2 reciprocal, grade-specific, or repeated source assertions for the same predecessor/date. 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.
Source documents (2)
Reviewed September 23, 2026 against references 1 and 2.
- Charles A. Malin/Bureau of Naval Personnel, Compilation of Enlisted Ratings and Apprenticeships, U.S. Navy, 1775 to 1969 (rev. Dec. 1969)
1. #anchord, Driver entry; #anchorm, Mechanic entry; reproduced on archived Ohio PDF p. 7, 10 · source dated December 1969 · cited by the explanation
Open source document (opens in a new tab)3.Charles A. Malin/Bureau of Naval Personnel, Compilation of Enlisted Ratings and Apprenticeships, U.S. Navy, 1775 to 1969 (rev. Dec. 1969) · event transcription · docs/legacy-data/navy-rating-history.jsonl:45; #anchord, Driver entry; #anchorm, Mechanic entry; reproduced on archived Ohio PDF p. 7, 10
Open source document (opens in a new tab) - Charles A. Malin/Bureau of Naval Personnel, Abbreviations Used for Navy Enlisted Ratings (1970)
2. alphabetic abbreviation list, MM(CBE), CD, CM entries · source dated 1970 · cited by the explanation
Open source document (opens in a new tab)