Marine Corps MOS · Combat & Infantry
0331 Machine Gunner
Current service use not established
This code is listed in the directory. Inclusion alone does not confirm current service use.
Overview
A Machine Gunner tactically employs light, medium, and heavy machine guns and their support vehicles. Machine Gunners provide direct fire for infantry rifle units, and noncommissioned officers lead teams, squads, or sections.
Minimum ASVAB: EL 90 or GT 90 or MM 90
ASVAB policy: Not policy-reviewed · coverage unknown · as of 2026-10-19
Program scope has not been reviewed.
Policy applicability and coverage of the program's score routes have not been reviewed. Shown-route arithmetic is not an eligibility decision.
Source: navmc-1200-1l-fy26 (source date 2025-03). Policy applicability has not been established.
Core Skills
- Tactical employment of machine-gun support vehicles
- Infantry direct-fire support across multiple unit sizes
- Weapons team, squad, and section leadership for NCOs
Notes & Sources
Evidence for this guidance (1 document)
- NAVMC 1200.1L (FY26, in force): MOS 0331
[1] MOS 0331 section "a. Summary"; cached text line 27939; NAVMC 1200.1L signed 2025-03-07, in force until 2026-10-01
Supports: Tactical employment of machine-gun support vehicles, Infantry direct-fire support across multiple unit sizes, Weapons team, squad, and section leadership for NCOs
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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