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Marine Corps MOS · Engineering

1120 Utilities Officer (UO)

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

Utilities Officers advise commanders on employing utilities personnel and equipment, translate operational requirements into support packages, and direct water, hygiene, laundry, power generation, and electrical distribution operations. They coordinate the installation, maintenance, and repair of environmental control units and refrigeration equipment, inspect electrical systems, and manage water quality assurance and disposal systems.

Core Skills

  • Operational requirements translation into utilities support
  • Water purification and quality assurance oversight
  • Tactical power generation and distribution planning
  • Electrical equipment repair and quality inspections

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.

Water and Wastewater Treatment Plant and System Operators

Directing water purification, storage, distribution, quality assurance, and disposal operations provides relevant systems experience for treatment plant operations.

How to prepare: Contact a local utility about supervised operator-trainee positions and the state's licensing progression. Operators typically need at least a high school diploma or equivalent and long-term on-the-job training; a state license is usually required, with requirements varying by state and interstate recognition not automatic.

What the civilian work involves
  • Collect and test water and sewage samples, using test equipment and color analysis standards.
  • Operate and adjust controls on equipment to purify and clarify water, process or dispose of sewage, and generate power.
  • Inspect equipment or monitor operating conditions, meters, and gauges to determine load requirements and detect malfunctions.
Civilian tools and software (examples)
  • Data logging software

Power Plant Operators

Planning and directing tactical power generation and electrical distribution operations provides a foundation for learning stationary generating plant operations.

How to prepare: Ask nonnuclear generating plants about operator-trainee openings and their site-specific training programs. Entry typically requires at least a high school diploma or equivalent, followed by extensive onsite training and several years to reach full competence; ongoing training and, for some job functions, state licensing also apply.

What the civilian work involves
  • Control generator output to match the phase, frequency, or voltage of electricity supplied to panels.
  • Monitor power plant equipment and indicators to detect evidence of operating problems.
  • Start or stop generators, auxiliary pumping equipment, turbines, or other power plant equipment as necessary.
Civilian tools and software (examples)
  • Computerized maintenance management system CMMS

Notes & Sources

Evidence for this guidance (5 documents)
  1. NAVMC 1200.1L (FY26, in force): MOS 1120

    [1] MOS 1120 section "a. Summary"; cached text line 5659; NAVMC 1200.1L signed 2025-03-07, in force until 2026-10-01

    Supports: Operational requirements translation into utilities support, Water purification and quality assurance oversight, Tactical power generation and distribution planning, Electrical equipment repair and quality inspections, Water and Wastewater Treatment Plant and System Operators (O*NET 51-8031.00), Power Plant Operators (O*NET 51-8013.00)

  2. O*NET: Water and Wastewater Treatment Plant and System Operators

    [2] O*NET 30.3 occupational data

    Supports: Water and Wastewater Treatment Plant and System Operators (O*NET 51-8031.00)

  3. Bureau of Labor Statistics: Water and Wastewater Treatment Plant and System Operators

    [3] How to Become; Training and Licenses; updated August 27, 2026

    Supports: Water and Wastewater Treatment Plant and System Operators (O*NET 51-8031.00)

  4. O*NET: Power Plant Operators

    [4] O*NET 30.3 occupational data

    Supports: Power Plant Operators (O*NET 51-8013.00)

  5. Bureau of Labor Statistics: Power Plant Operators, Distributors, and Dispatchers

    [5] How to Become One, Training and Licenses; retrieved 23 September 2026

    Supports: Power Plant Operators (O*NET 51-8013.00)

Defense contractor jobs for 1120

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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