⚓ U.S. Navy — Rating Exposure Profile
Machinist's Mate (MM) — Asbestos Exposure
Last updated July 11, 2026
Machinist's Mates operated and maintained propulsion machinery — steam turbines, reduction gears, pumps, and evaporators — in the heart of Navy ships' engineering plants. These spaces were packed with asbestos-insulated piping, boiler block, and turbine casing, making MMs among the most heavily exposed ratings in the fleet.
Spaces & Work Areas
Machinist's Mate (MM) sailors regularly worked in:
- Main engine room
- Auxiliary machinery rooms
- Pump rooms
- Shaft alley
- Evaporator spaces
How MMs Were Exposed
MMs worked daily among lagged steam lines, insulated valves, and asbestos gaskets at pipe flanges. Routine maintenance — repacking valve stems, replacing gaskets, cleaning turbine casings — released asbestos fibers directly at face level. The enclosed, poorly ventilated spaces concentrated airborne dust.
U.S. Navy ships built before approximately 1980 used asbestos-containing insulation, gaskets, and fireproofing materials throughout their engineering plants and throughout the ship. Sailors in the Machinist's Mate (MM) rating were among those most regularly in contact with these materials.
Ship Types Where MMs Served
Machinist's Mate (MM) sailors were assigned across multiple ship types. Asbestos was used throughout all of these vessel types during the pre-1980 construction era:
VA Claims & Legal Options
Your DD-214 and service record should list your NEC (Navy Enlisted Classification) code. MOs rate VA disability even without a specific product identified — a mesothelioma attorney can pull ship deck logs to corroborate exposure.
Two Paths: VA Disability & Asbestos Trust Funds
- VA disability compensation — Monthly benefit for service-connected asbestos-related disease. Requires a diagnosis, evidence of in-service exposure (your rating and ship records), and a nexus statement linking the two.
- Asbestos trust fund claims — Lump-sum payments from bankruptcy trusts funded by asbestos product manufacturers. Requires identifying specific products used aboard your ship class. Multiple trusts may apply to a single claimant.
These paths are not mutually exclusive — many veterans pursue both.
Navy veterans overview › Free Legal Review ›
Asbestos.cam is an informational resource, not a law firm. The above is general information, not legal advice. Consult a qualified attorney for guidance on your specific situation.
Frequently Asked Questions
Why were Machinist's Mates at especially high risk for asbestos exposure?
MMs worked inside the engineering plant for every watch — often 4 hours on, 8 hours off — throughout their deployment. The steam propulsion systems they maintained ran at high temperatures requiring thick asbestos insulation on every pipe, fitting, and turbine casing. When insulation crumbled or was disturbed for maintenance, fibers became airborne in confined, poorly-ventilated spaces.
Can a Machinist's Mate claim VA disability for asbestos exposure?
Yes. The VA recognizes asbestos exposure as a service-connected risk for MMs and other engineering ratings. You do not need to identify a specific asbestos product — your rating, the ship class you served on, and a mesothelioma or asbestosis diagnosis are the key elements. A Veterans Service Organization (VSO) can help you file at no cost.
What diseases are linked to asbestos exposure in Machinist's Mates?
Mesothelioma (cancer of the lung lining), asbestos-related lung cancer, asbestosis (scarring of the lung tissue), and pleural plaques are all associated with sustained asbestos exposure. These diseases typically appear 20–50 years after exposure, which is why many Navy veterans are receiving diagnoses today.