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Army MOS · Engineering

91J Quartermaster and Chemical Equipment Repairer

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 Quartermaster and Chemical Equipment Repairer performs or supervises maintenance at the unit, direct support, and general support levels. The repairer works on chemical equipment, quartermaster machinery, forced air heaters, and special purpose equipment.

Minimum ASVAB: MM 87

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: smartbook-611-21-ch10c-fy2025 (source date 2025-12). Policy applicability has not been established.

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Core Skills

  • Forced air heater maintenance
  • Direct and general support equipment maintenance

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.

Industrial Machinery Mechanics

Maintenance of quartermaster machinery, forced air heaters, and special-purpose equipment transfers to maintaining and repairing industrial machinery.

How to prepare: Take a hands-on industrial machinery maintenance course that includes component replacement, disassembly, and reassembly of production equipment.

What the civilian work involves
  • Repair or maintain the operating condition of industrial production or processing machinery or equipment.
  • Repair or replace broken or malfunctioning components of machinery or equipment.
  • Disassemble machinery or equipment to remove parts and make repairs.

Training & Development

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

Career Growth

  • Certified Maintenance and Reliability Professionals (CMRP)

    Demonstrate maintenance and reliability knowledge when pursuing broader industrial machinery maintenance responsibilities.

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

    For: Industrial Machinery Mechanics

Notes & Sources

Evidence for this guidance (4 documents)
  1. Army COOL MOC feed: 91J Quartermaster and Chemical Equipment Repairer

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

    Supports: Forced air heater maintenance, Direct and general support equipment maintenance, Industrial Machinery Mechanics (O*NET 49-9041.00)

  2. O*NET: Industrial Machinery Mechanics

    [2] O*NET 30.3 occupational data

    Supports: Industrial Machinery Mechanics (O*NET 49-9041.00)

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

    [3] 91J 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 91J

Predecessor codes

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

63J1Quartermaster and Chemical Equipment Repairer63J2Quartermaster and Chemical Equipment 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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