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Army MOS · Engineering

91X Maintenance Supervisor

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

Maintenance Supervisors perform and supervise field and sustainment maintenance on tracked and wheeled vehicles, construction equipment, and special purpose equipment. They also oversee maintenance for power generation, climate control, fire control, weapons, and related test equipment, supervise machine shop or metalworking activities, and direct vehicle recovery and electrical wiring harness repairs.

Core Skills

  • Tracked and wheeled vehicle recovery supervision
  • Construction and material handling equipment maintenance
  • Fire control and related test equipment maintenance
  • Vehicle electrical wiring harness repair

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.

Fleet and Equipment Maintenance Supervisor

Supervising vehicle and construction equipment maintenance, recovery operations, and metalworking shops transfers directly to civilian repair-shop supervision.

How to prepare: Build a work-history portfolio identifying the equipment maintained, repair teams supervised, and examples of completed repairs for fleet or heavy-equipment employers.

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.
  • Monitor employees' work levels and review work performance.
  • Perform skilled repair or maintenance operations, using equipment such as hand or power tools, hydraulic presses or shears, or welding equipment.
Civilian tools and software (examples)
  • Microsoft Excel

Maintenance and Repair Workers, General

Hands-on maintenance of generators, pumps, air compressors, and material handling equipment provides a strong foundation for general equipment repair.

How to prepare: Compare local equipment-maintenance openings with your hands-on repair history, then seek practical training on an unfamiliar machine type used by your target employers.

What the civilian work involves
  • Perform routine maintenance, such as inspecting drives, motors, or belts, checking fluid levels, replacing filters, or doing other preventive maintenance actions.
  • Inspect, operate, or test machinery or equipment to diagnose machine malfunctions.
  • Repair machines, equipment, or structures, using tools such as hammers, hoists, saws, drills, wrenches, or equipment such as precision measuring instruments or electrical or electronic testing devices.

Training & Development

Choose credentials for your target role. COOL funding markers describe program listings, not a guarantee of eligibility or funding.

Getting Started

  • Certified Maintenance and Reliability Professionals (CMRP)

    Document maintenance and reliability knowledge supporting a transition into civilian maintenance supervision.

    Eligibility and preparation: No minimum education or work experience is required; candidates must not have taken the exam within the preceding six months.

    For: Fleet and Equipment Maintenance Supervisor

Notes & Sources

Evidence for this guidance (5 documents)
  1. Army COOL MOC feed: 91X Maintenance Supervisor

    [1] data/authority/army-codes.json entry 91X (OSD COOL feed, fetched 2026-07-25); DB rank enlisted, authority codeType enlisted

    Supports: Tracked and wheeled vehicle recovery supervision, Construction and material handling equipment maintenance, Fire control and related test equipment maintenance, Vehicle electrical wiring harness repair, Fleet and Equipment Maintenance Supervisor (O*NET 49-1011.00), Maintenance and Repair Workers, General (O*NET 49-9071.00)

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

    [2] O*NET 30.3 occupational data

    Supports: Fleet and Equipment Maintenance Supervisor (O*NET 49-1011.00)

  3. O*NET: Maintenance and Repair Workers, General

    [3] O*NET 30.3 occupational data

    Supports: Maintenance and Repair Workers, General (O*NET 49-9071.00)

  4. COOL credential mapping: Certified Maintenance and Reliability Professionals (CMRP)

    [4] 91X cached COOL credential feed

    Supports: Certified Maintenance and Reliability Professionals (CMRP)

  5. Society for Maintenance and Reliability Professionals: CMRP eligibility

    [5] Eligibility; retrieved 23 September 2026

    Supports: Certified Maintenance and Reliability Professionals (CMRP)

Defense contractor jobs for 91X

Predecessor codes

Historical codes with documented links to 91X. Each history page explains the change.

63X4Maintenance Supervisor91K4Armament Repairer

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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