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74D CBRN Specialist
U.S. Army
Equivalent: 5711 (USMC CBRN Defense Specialist)
Formerly: 54B Chemical Operations Specialist (pre-1999), Nuclear, Biological, Chemical (NBC) Specialist
The 74D CBRN (Chemical, Biological, Radiological, Nuclear) Specialist detects, identifies, and decontaminates CBRN hazards. Training and operations involve exposure to chemical agents, radiological materials, and biological hazards in controlled and field environments. Post-9/11 deployments added combat exposure to the traditional CBRN mission.
OCCUPATIONAL HAZARDS & PHYSICAL DEMANDS
-Working in full MOPP gear (Mission Oriented Protective Posture) — heat stress, restricted breathing
-Chemical agent exposure during training (CS, OC, controlled agent training at CDTF)
-Heavy equipment operation (decontamination systems, M26 JLIST, M12A1)
-Extended physical activity in protective equipment (20+ lbs additional weight, restricted mobility)
-Deployed: convoy operations, base defense, plus CBRN mission
-Exposure to depleted uranium, burn pit smoke, industrial chemicals during deployment
SERVICE-CONNECTED CONDITIONS (7 MAPPED)
Tap a condition to expand. Use the links inside to learn more, check your rating, or prep for your exam.
TYPICAL RATING CONSTELLATION
A 74D with deployment commonly has: PTSD (50%), sinusitis (10-30%), asthma/respiratory (10-30%), lumbar spine (10-20%), skin condition (10-30%), tinnitus (10%), toxic exposure. Combined: 70-90%.
KEY CLAIM TIP
74D veterans have UNIQUE toxic exposure documentation that other MOS codes lack. Your training records document controlled chemical agent exposure. Combined with deployment burn pit exposure, you have a dual-path claim: occupational chemical exposure AND PACT Act presumptive. Preserve all training records from CDTF and any chemical exposure documentation.
YOUR NEXT STEPS
RELATED MOS
EDUCATIONAL TOOL ONLY. NOT LEGAL OR MEDICAL ADVICE.
NOT AFFILIATED WITH THE U.S. DEPARTMENT OF VETERANS AFFAIRS.
CLAIM RECON 2026
NOT AFFILIATED WITH THE U.S. DEPARTMENT OF VETERANS AFFAIRS.
CLAIM RECON 2026