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Marine Corps MOS · Engineering

2120 Ground Ordnance Maintenance Officer

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

A Ground Ordnance Maintenance Officer manages equipment readiness, accountability, and security while advising commanders on the use of maintenance resources. The officer oversees personnel recovering, salvaging, and maintaining weapons and other ground ordnance systems, and establishes production lines, inspection procedures, and quality assurance for repaired equipment.

Core Skills

  • Equipment readiness and availability forecasting
  • Repair production lines and inspection procedures
  • Mission-based maintenance support package planning
  • Hazardous waste storage and disposal oversight

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.

First-Line Supervisors of Mechanics, Installers, and Repairers

Supervising ordnance maintenance personnel, monitoring work progress, and establishing repair inspection procedures transfer directly to maintenance shop supervision.

How to prepare: Build a maintenance-supervision portfolio showing how you allocated personnel, tracked repair workloads, and verified repaired equipment against inspection standards.

What the civilian work involves
  • Inspect, test, and measure completed work, using devices such as hand tools or gauges to verify conformance to standards or repair requirements.
  • Inspect and monitor work areas, examine tools and equipment, and provide employee safety training to prevent, detect, and correct unsafe conditions or violations of procedures and safety rules.
  • Monitor employees' work levels and review work performance.
Civilian tools and software (examples)
  • Microsoft Excel
  • Microsoft Project

Industrial Engineering Technologists and Technicians

Establishing maintenance production lines, managing personnel utilization, and overseeing repair quality assurance provide a foundation for maintenance process improvement and quality monitoring.

How to prepare: Complete a practical work-study project that measures a repair process, identifies delays, and proposes a revised workflow with quality checks.

What the civilian work involves
  • Study time, motion, methods, or speed involved in maintenance, production, or other operations to establish standard production rate or improve efficiency.
  • Read worker logs, product processing sheets, or specification sheets to verify that records adhere to quality assurance specifications.
  • Verify that equipment is being operated and maintained according to quality assurance standards by observing worker performance.
Civilian tools and software (examples)
  • Microsoft Excel

Notes & Sources

Evidence for this guidance (3 documents)
  1. NAVMC 1200.1L (FY26, in force): MOS 2120

    [1] MOS 2120 section "a. Summary"; cached text line 7200; NAVMC 1200.1L signed 2025-03-07, in force until 2026-10-01

    Supports: Equipment readiness and availability forecasting, Repair production lines and inspection procedures, Mission-based maintenance support package planning, Hazardous waste storage and disposal oversight, First-Line Supervisors of Mechanics, Installers, and Repairers (O*NET 49-1011.00), Industrial Engineering Technologists and Technicians (O*NET 17-3026.00)

  2. O*NET: First-Line Supervisors of Mechanics, Installers, and Repairers

    [2] O*NET 30.3 occupational data

    Supports: First-Line Supervisors of Mechanics, Installers, and Repairers (O*NET 49-1011.00)

  3. O*NET: Industrial Engineering Technologists and Technicians

    [3] O*NET 30.3 occupational data

    Supports: Industrial Engineering Technologists and Technicians (O*NET 17-3026.00)

Defense contractor jobs for 2120

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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