CBRN defense specialists' primary responsibility is to ensure their unit is trained and ready to survive and operate in a CBRN environment. CBRN defense specialist assists, conduct, and supervise training in CBRN defense monitor, survey and reconnaissance, chemical detection and identification, biological agent collection and sampling, decontamination of personnel, equipment and casualties, and in individual protective measures and firs aid for unit personnel. CBRN defense specialties also operate within the unit's combat operations center assisting CBRN defense officers in providing commanders in recommended courses of action to meet operational objectives and facilitate mission accomplishment as they relate to CBRN defense. CBRN defense specialists provide tactical information to the commander relative to radiation exposure status, location of contaminated areas on the battlefield, and readiness status of their unit's CBRN defense equipment.Instructed over 20,000 junior and senior Marines on individual survival methods in contaminated environments.