⚓ U.S. Navy — Minesweepers
Aggressive MSO-422
The Aggressive MSO-422 consisted of 57 vessels. Like all U.S. Navy minesweepers built during the asbestos era, these ships used asbestos-containing insulation throughout their engineering plants. Veterans who served in engineering spaces aboard Aggressive MSO-422 ships may have been exposed to asbestos fibers.
Asbestos Exposure Aboard Aggressive MSO-422 Ships
Asbestos was the standard thermal insulation material in U.S. Navy minesweepers built before approximately 1980. Common sources of asbestos exposure aboard Aggressive MSO-422 vessels included:
- Pipe lagging and block insulation in boiler rooms and engine rooms
- Gaskets at pipe flanges throughout the engineering plant
- Valve stem packing and pump seals
- Turbine casing insulation and expansion joint material
- Asbestos rope, cloth, and tape used for sealing and repair work
For detailed information on spaces and products specific to minesweepers, see the Minesweepers asbestos overview ›
At-Risk Ratings Aboard Aggressive MSO-422 Ships
The following ratings had regular contact with asbestos-containing materials aboard minesweepers of this era. If you served in one of these ratings, document it when filing a VA disability or asbestos trust fund claim.
Ships in the Aggressive MSO-422 (57 vessels)
| Ship Name | Hull No. | Notes |
|---|---|---|
| USS Aggressive | MSO-422 | |
| USS Avenge | MSO-423 | |
| USS Bold | MSO-424 | |
| USS Bulwark | MSO-425 | |
| USS Conflict | MSO-426 | |
| USS Constant | MSO-427 | |
| USS Dash | MSO-428 | |
| USS Detector | MSO-429 | |
| USS Direct | MSO-430 | |
| USS Dominant | MSO-431 | |
| USS Dynamic | MSO-432 | |
| USS Engage | MSO-433 | |
| USS Embattle | MSO-434 | |
| USS Endurance | MSO-435 | |
| USS Energy | MSO-436 | |
| USS Enhance | MSO-437 | |
| USS Esteem | MSO-438 | |
| USS Excel | MSO-439 | |
| USS Exploit | MSO-440 | |
| USS Exultant | MSO-441 | |
| USS Fearless | MSO-442 | |
| USS Fidelity | MSO-443 | |
| USS Firm | MSO-444 | |
| USS Force | MSO-445 | |
| USS Fortify | MSO-446 | |
| USS Guide | MSO-447 | |
| USS Illusive | MSO-448 | |
| USS Impervious | MSO-449 | |
| USS Implicit | MSO-455 | |
| USS Inflict | MSO-456 | |
| USS Loyalty | MSO-457 | |
| USS Lucid | MSO-458 | |
| USS Nimble | MSO-459 | |
| USS Notable | MSO-460 | |
| USS Observer | MSO-461 | |
| USS Pinnacle | MSO-462 | |
| USS Pivot | MSO-463 | |
| USS Pluck | MSO-464 | |
| USS Prestige | MSO-465 | |
| USS Prime | MSO-466 | |
| USS Reaper | MSO-467 | |
| USS Rival | MSO-468 | |
| USS Sagacity | MSO-469 | |
| USS Salute | MSO-470 | |
| USS Skill | MSO-471 | |
| USS Valor | MSO-472 | |
| USS Vigor | MSO-473 | |
| USS Vital | MSO-474 | |
| USS Conquest | MSO-488 | |
| USS Gallant | MSO-489 | |
| USS Leader | MSO-490 | |
| USS Persistent | MSO-491 | |
| USS Pledge | MSO-492 | |
| USS Stalwart | MSO-493 | |
| USS Sturdy | MSO-494 | |
| USS Swerve | MSO-495 | |
| USS Venture | MSO-496 |
VA Benefits & Legal Options for Aggressive MSO-422 Veterans
Veterans diagnosed with mesothelioma, asbestosis, pleural plaques, or asbestos-related lung cancer who served aboard Aggressive MSO-422 ships may be eligible for:
- VA disability compensation — monthly benefit; requires diagnosis plus evidence of shipboard service. No manufacturer identification needed.
- Asbestos trust fund claims — lump-sum payments from trusts funded by bankrupt asbestos manufacturers (Johns-Manville, Owens Corning, and others). Requires identifying specific products used aboard.
These two paths are not mutually exclusive. Many veterans pursue both.
Full claim guidance for Minesweepers › 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
Did Aggressive MSO-422 ships use asbestos?
Yes. The Aggressive MSO-422 was built during the era when asbestos was the standard insulation material in U.S. naval construction. Engineering spaces aboard these vessels contained asbestos pipe lagging, boiler block insulation, gaskets, and valve packing. Veterans who worked in boiler rooms, engine rooms, or repair roles had the highest likelihood of exposure.
How do I prove I served aboard a Aggressive MSO-422 ship for a VA claim?
Your DD-214 (Certificate of Release or Discharge from Active Duty) lists your ship assignments. Additional documentation includes ship deck logs (available from the National Archives), official orders, and buddy statements from fellow crew members. A Veterans Service Organization (VSO) can help you gather and submit this evidence at no cost.
What asbestos products were used aboard Aggressive MSO-422 ships?
Common asbestos products used in U.S. Navy minesweepers of this era included Kaylo pipe insulation (Owens-Illinois), Unibestos block insulation (Pittsburgh Corning), 85% magnesia pipe covering (various manufacturers), Flexitallic spiral-wound gaskets, and Johns-Manville pipe covering. A mesothelioma attorney who specializes in Navy claims maintains detailed product-identification databases for specific ship classes.
Did You Serve Aboard Aggressive MSO-422?
If you or a family member served aboard Aggressive MSO-422, you may have been exposed to asbestos. Sharing your service information is completely voluntary and may help build the historical record of shipboard exposure — information that can be valuable in VA disability and asbestos trust fund claims.
What we do with your information: Your submission goes into a private moderation queue. We will never publish your name, contact details, or diagnosis information publicly. The only information that may appear publicly is an anonymized count of verified veterans who have reported serving on this ship. We will not sell, rent, or share your information with third parties except as necessary to respond to your specific request. You may request deletion of your information at any time.
To request that your information be removed: Data Removal Request ›