mos.directory

Army MOS · Engineering

91S STRYKER Systems Maintainer

Current service use not established

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

Browse Army

Overview

A Stryker systems maintainer performs and supervises field level maintenance on the Stryker family of vehicles. This maintainer services variants including infantry carriers, reconnaissance vehicles, mobile gun systems, mortar carriers, medical evacuation vehicles, and engineer support vehicles.

Minimum ASVAB: MM 92

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.

See if you would hit this score: free ASVAB practice test

Core Skills

  • Field maintenance across specialized Stryker variants
  • Stryker field maintenance supervision

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 field-level maintenance across the Stryker vehicle family provides a direct foundation for maintaining and repairing mobile heavy equipment.

How to prepare: Practice using a target equipment manufacturer's service manual to plan a component replacement and its post-repair performance checks.

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.
  • Read and understand operating manuals, blueprints, and technical drawings.
Civilian tools and software (examples)
  • Maintenance management software
  • Recordkeeping software

Bus and Truck Mechanics and Diesel Engine Specialists

Stryker field-level vehicle maintenance provides transferable repair experience for commercial bus and truck maintenance.

How to prepare: Take a hands-on commercial vehicle diagnostics course covering brake and steering inspections and test-instrument use.

What the civilian work involves
  • Inspect brake systems, steering mechanisms, wheel bearings, and other important parts to ensure that they are in proper operating condition.
  • Adjust and reline brakes, align wheels, tighten bolts and screws, and reassemble equipment.
  • Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
Civilian tools and software (examples)
  • Computerized maintenance management system software CMMS
  • Cummins INSITE

Notes & Sources

Evidence for this guidance (3 documents)
  1. Army COOL MOC feed: 91S STRYKER Systems Maintainer

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

    Supports: Field maintenance across specialized Stryker variants, Stryker field maintenance supervision, Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00), Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

  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)

  3. O*NET: Bus and Truck Mechanics and Diesel Engine Specialists

    [3] O*NET 30.3 occupational data

    Supports: Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

Defense contractor jobs for 91S

Predecessor codes

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

91XHealth Physics Specialist

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

Report an error on this page