57 Chemical, Biological, Radiological, and Nuclear Defense
Marine Corps OccFld 57 is the chemical, biological, radiological, and nuclear defense field. It is a specialist community built around protection, response, training, and commander support in hazardous environments.
This field fits Marines who can stay disciplined when the work is uncomfortable, gear-heavy, and procedure-driven.
The field is easy to misunderstand because it is specialized and not huge. The work is not only about decontamination. It also includes training, readiness support, detection, and helping units think clearly about hazardous conditions. That gives the field a blend of technical, operational, and instructional work that many other specialties do not share.
At a Glance
| Area | What to know |
|---|---|
| Field purpose | Prepare for, protect against, and respond to CBRN threats and incidents |
| Representative roles | 5711 and 5713 CBRN Defense Specialist paths, plus the 5702 warrant route |
| Screening themes | Protective-equipment comfort, procedure discipline, and calm performance under stress |
| Training anchor | Boot Camp, Marine Combat Training, and CBRN schoolhouse training before unit repetition |
| Reserve note | Reserve access exists, but billet structure and mission mix shape the real experience |
Which Role Fits You?
Choose 5711 CBRN Defense Specialist if chemical, biological, radiological, and nuclear threats don’t care what else the unit is dealing with.
Choose 5713 CBRN Defense Specialist if the 5713 is not a different specialty.
Common Entry Requirements
All enlisted Marines in this occupational field enlist with a minimum AFQT of 31, a high school diploma, U.S. citizenship, and MEPS medical clearance. Boot Camp is the first training gate: 13 weeks at MCRD San Diego or Parris Island. After graduation, Marines complete Marine Combat Training or the Infantry Training Battalion before attending their MOS-specific school. See each role’s profile below for specific ASVAB line scores, training details, and additional requirements.
Career Field Directory
- 5711 CBRN Defense Specialist : Chemical, biological, radiological, and nuclear threats don’t care what else the unit is dealing with
- 5713 CBRN Defense Specialist : The 5713 is not a different specialty
Related Resources
Use the ASVAB guide and PiCAT guide for general planning. Then compare How to Become a Warrant Officer if you want to understand the specialist progression side of the field.