Career Retention Specialist
The manual took effect May 15, 2006, but no specific implementation date for the 8421-to-0143 change is given. The year 2006 identifies the manual transition, not a confirmed completion date.
Source extraction notes
The cited source prints the MOS code but not its occupational title; no title was inferred. Enlisted MOS moved from category 8000/9000 to a regular occupational field. 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 and 2.
- MARADMIN 329/06, MOS Manual Changes and Conversions
1. MARADMIN 329/06, paragraph 1.B(2), enlisted block, lines 129-134 · 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:65; MARADMIN 329/06, paragraph 1.B(2), enlisted block, lines 129-134
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. 3-518 / PDF p. 709, MOS 8421 title row · cited by the explanation
PDF page 709 (opens in a new tab)