Navy Rating MM

Machinist's Mate (MMN Nuclear, MMW Submarine Weapons)

Navy MM (Machinist's Mate (MMN Nuclear, MMW Submarine Weapons)) typically involves mechanical systems maintenance, submarine or confined maritime duty, ordnance and weapons handling, nuclear systems operations.

Common Exposures

🌦️ Environmental
Confined spaces, recycled air, limited sunlight
🔊 Noise
Machinery noise in enclosed spaces
🧪 Chemicals
Diesel fumes, cleaning agents, nuclear materials
🪖 Combat/Stress
Isolation, extended deployments
🔊 Noise
Weapons fire, explosions during testing
🧪 Chemicals
Gun cleaning solvents, propellants, explosive residue
💪 Physical Strain
Lifting heavy ordnance and equipment
📡 Radiation
Exposure to nuclear reactor systems
🔊 Noise
Machinery noise in engineering spaces
🌦️ Environmental
Confined engineering spaces, heat
🔊 Noise
Engine and machinery noise
🧪 Chemicals
Diesel fumes, oil, solvents, hydraulic fluid
💪 Physical Strain
Heavy lifting, repetitive motions
🌦️ Environmental
Heat, confined engine spaces

Likely Service-Connected Conditions

Diagnostic Code Condition Likelihood Reasoning
5237 Lumbosacral or cervical strain High Heavy lifting and awkward positions
6260 Tinnitus, recurrent High Machinery noise in enclosed submarine spaces
6847 Sleep Apnea Syndromes High Disrupted sleep patterns in submarine rotations
5242 Degenerative arthritis, degenerative disc disease other than intervertebral disc syndrome (also, see either DC 5003 or 5010) Medium Repetitive strain from mechanical work
9411 Posttraumatic stress disorder Medium Extended isolation and deployment stress
9434 Major depressive disorder Medium Isolation and confinement stress

☢️ PACT Act & Toxic Exposure

Select the era that best matches when you served to see how this job’s toxic exposures changed over time.

PACT Act guide Use exposure finder
Vietnam Era 📅 1962-1975
Asbestos
Exposure from older brakes, insulation, gaskets, and engine-room materials.
Diesel / JP Fuel
Routine fuel exposure during engine maintenance and repair.
Hydraulic Fluid
Exposure during repair of fluid power systems and equipment.
Noise
Chronic machinery and engine noise exposure.
Solvents
Degreasers, parts cleaners, and solvent baths used in mechanical work.
Cold War Era 📅 1945-1991
Asbestos
Exposure from older brakes, insulation, gaskets, and engine-room materials.
Asbestos
Heavy asbestos exposure in ship insulation, engine rooms, and brake systems.
Diesel / JP Fuel
Routine fuel exposure during engine maintenance and repair.
Hydraulic Fluid
Exposure during repair of fluid power systems and equipment.
Lead
Lead-based paints, solder, and industrial coatings in older platforms.
Noise
Chronic machinery and engine noise exposure.
Solvents
Degreasers, parts cleaners, and solvent baths used in mechanical work.
Gulf War Era 📅 1990-2001
Depleted Uranium
PACT Act
Potential uranium dust exposure in damaged or recovered vehicles.
Oil Contamination
PACT Act
Work on vehicles and equipment fouled by petroleum smoke and residue.
Asbestos
Exposure from older brakes, insulation, gaskets, and engine-room materials.
Diesel / JP Fuel
Routine fuel exposure during engine maintenance and repair.
Hydraulic Fluid
Exposure during repair of fluid power systems and equipment.
Noise
Chronic machinery and engine noise exposure.
Solvents
Degreasers, parts cleaners, and solvent baths used in mechanical work.
Post-9/11 Era 📅 2001-present
Burn Pits
PACT Act
Ongoing exposure to burn pit smoke while maintaining vehicles and generators.
PFAS Exposure
PACT Act
Potential PFAS exposure from contaminated base water or firefighting foam runoff.
Sand / Dust Particulates
PACT Act
Heavy dust ingress into engines and repair bays.
Asbestos
Exposure from older brakes, insulation, gaskets, and engine-room materials.
Diesel / JP Fuel
Routine fuel exposure during engine maintenance and repair.
Hydraulic Fluid
Exposure during repair of fluid power systems and equipment.
Noise
Chronic machinery and engine noise exposure.
Solvents
Degreasers, parts cleaners, and solvent baths used in mechanical work.