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Marine Corps MOS · Support

8991 Sergeant Major of The Marine Corps

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

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Overview

The Sergeant Major of the Marine Corps assists and advises the CMC on matters involving enlisted personnel. This senior enlisted Marine serves on the enlisted performance and permanent uniform boards, joins visits and inspections involving enlisted personnel, assists staff agencies when directed, and represents the CMC at the Staff Noncommissioned Officers symposium.

Core Skills

  • Enlisted performance and uniform board participation
  • Staff-agency advising on enlisted personnel
  • Command representation at senior enlisted symposia

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Human Resources Managers

Advising the Commandant and staff agencies on enlisted personnel and serving on the enlisted performance board provide a foundation for civilian employee-relations work.

How to prepare: Complete a civilian employee-relations course covering employment law, contracts, workplace disputes, and disciplinary procedures. Employers may also expect relevant civilian HR experience beyond senior personnel advising, so consider an employee-relations or HR program role as a bridge to HR management.

What the civilian work involves
  • Serve as a link between management and employees by handling questions, interpreting and administering contracts and helping resolve work-related problems.
  • Plan, direct, supervise, and coordinate work activities of subordinates and staff relating to employment, compensation, labor relations, and employee relations.
Civilian tools and software (examples)
  • Workday software

Notes & Sources

Evidence for this guidance (2 documents)
  1. NAVMC 1200.1L (FY26, in force): MOS 8991

    [1] MOS 8991 section "a. Summary"; cached text line 58423; NAVMC 1200.1L signed 2025-03-07, in force until 2026-10-01

    Supports: Enlisted performance and uniform board participation, Staff-agency advising on enlisted personnel, Command representation at senior enlisted symposia, Human Resources Managers (O*NET 11-3121.00)

  2. O*NET: Human Resources Managers

    [2] O*NET 30.3 occupational data

    Supports: Human Resources Managers (O*NET 11-3121.00)

Defense contractor jobs for 8991

Predecessor codes

Historical codes with documented links to 8991. Each history page explains the change.

9991Sergeant Major of the Marine Corps

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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