Sergeant Major of the Marine Corps
The manual was effective May 15, 2006, but personnel implementation was explicitly deferred, with no specific conversion date given for MOS 9991. July 20, 2006, is the announcement's publication date, not an established implementation date.
Source extraction notes
The cited source prints the MOS code but not its occupational title; no title was inferred. Enlisted MOS moved from reporting category 9000 to miscellaneous-requirements category 8000. The manual is effective 2006-05-15, but personnel/HRDP implementation is explicitly deferred, so effective_to is null. No row-specific effective date is printed; year-only precision reflects the 2006 manual transition.
Source documents (2)
Reviewed September 24, 2026 against references 1, 2 and 3.
- MARADMIN 329/06, MOS Manual Changes and Conversions
1. MARADMIN 329/06, paragraph 1.B(1), enlisted block, lines 114-119 · source dated July 20, 2006 · cited by the explanation
Open source document (opens in a new tab)3.MARADMIN 329/06, MOS Manual Changes and Conversions · event transcription · docs/legacy-data/usmc-mos-conversions.jsonl:59; MARADMIN 329/06, paragraph 1.B(1), enlisted block, lines 114-119 · cited by the explanation
Open source document (opens in a new tab) - MCO P1200.16, Military Occupational Specialties Manual, 18 Apr 2005 (title source)
2. Figure 3-37, alphabetical listing of enlisted MOSs, printed p. 3-522 / PDF p. 713, MOS 9991 title row · cited by the explanation
PDF page 713 (opens in a new tab)