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Army MOS · Logistics

91A M1 Abrams Tank System Maintainer

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

An M1 Abrams Tank System Maintainer performs field maintenance on the M1 Abrams tank system. The maintainer also supervises field maintenance work on the system.

Minimum ASVAB: MM 99

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

  • Supervision of tank field 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.

Mobile Heavy Equipment Mechanics, Except Engines

Performing and supervising M1 Abrams field maintenance provides a directly relevant foundation for maintaining civilian mobile heavy equipment.

How to prepare: Arrange a hands-on skills assessment with a heavy-equipment service shop to identify equipment-specific training needs.

What the civilian work involves
  • Repair and replace damaged or worn parts.
  • Test mechanical products and equipment after repair or assembly to ensure proper performance and compliance with manufacturers' specifications.
  • Operate and inspect machines or heavy equipment to diagnose defects.
Civilian tools and software (examples)
  • Maintenance management software

Notes & Sources

Evidence for this guidance (2 documents)
  1. Army COOL MOC feed: 91A M1 Abrams Tank System Maintainer

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

    Supports: Supervision of tank field maintenance, Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

  2. O*NET: Mobile Heavy Equipment Mechanics, Except Engines

    [2] O*NET 30.3 occupational data

    Supports: Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

Defense contractor jobs for 91A

Predecessor codes

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

63A1M1 Abrams Tank System Maintainer63A2M1 Abrams Tank System Maintainer63A3M1 Abrams Tank System Maintainer63A4M1 Abrams Tank System Maintainer

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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