Army MOS · Logistics

91Z Senior Maintenance Supervisor

Current service use not established

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

Overview

A Senior Maintenance Supervisor plans, coordinates, and directs field and sustainment maintenance for wheeled, tracked, armament, power generation, and utility equipment. This supervisor serves as a principal maintenance or operations noncommissioned officer and oversees personnel who maintain tanks, artillery, fighting vehicles, armament, and fire control systems.

Core Skills

  • Field and sustainment maintenance coordination
  • Cross-specialty supervision of vehicle and armament maintainers
  • Battalion-level maintenance operations 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

Directing maintenance across wheeled, tracked, power-generation, and utility equipment transfers directly to coordinating civilian equipment maintenance teams.

How to prepare: Build a portfolio example showing how you would organize a civilian fleet maintenance workload, assign work across specialties, and review completed repairs.

What the civilian work involves
  • Monitor employees' work levels and review work performance.
  • 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.
Civilian tools and software (examples)
  • Microsoft Excel
  • Microsoft Project

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)

    Demonstrate maintenance and reliability knowledge relevant to civilian maintenance supervision.

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

    For: First-Line Supervisors of Mechanics, Installers, and Repairers

Notes & Sources

Evidence for this guidance (4 documents)
  1. Army COOL MOC feed: 91Z Senior Maintenance Supervisor

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

    Supports: Field and sustainment maintenance coordination, Cross-specialty supervision of vehicle and armament maintainers, Battalion-level maintenance operations oversight, First-Line Supervisors of Mechanics, Installers, and Repairers (O*NET 49-1011.00)

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

    [3] 91Z cached COOL credential feed

    Supports: Certified Maintenance and Reliability Professionals (CMRP)

  4. Society for Maintenance and Reliability Professionals: CMRP eligibility

    [4] Eligibility; retrieved 23 September 2026

    Supports: Certified Maintenance and Reliability Professionals (CMRP)

Defense contractor jobs for 91Z

Predecessor codes

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

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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