A Marine with the Chemical Biological Radiological and Nuclear (CBRN) unit receives assistance putting on a hazardous material suit during Assessment Consequence Management training at Marine Corps Air Station Miramar, California, May 6. The ACM training is conducted by CBRN once a month to maintain mission readiness. - A Marine with the Chemical Biological Radiological and Nuclear (CBRN) unit receives assistance putting on a hazardous material suit during Assessment Consequence Management training at Marine Corps Air Station Miramar, California, May 6. The ACM training is conducted by CBRN once a month to maintain mission readiness.