MOS 21M, Firefighter Duty Descriptions

In 2004, the Engineer MOS changed from CMF 12 to CMF 21. In 2009, the Engineer MOS changed again, from CMF 21 to CMF 12.


A firefighter is responsible for conducting rescue and firefighting operations in various situations, including fires, aircraft and vehicle accidents, and natural disasters. They also provide emergency response for hazardous materials incidents and assist law enforcement and medical personnel when needed. Firefighters maintain their lifesaver qualification and provide first aid to injured individuals. They test hydrant and fire suppression systems and alarms, maintain records and reports, and operate and perform operator-level maintenance on equipment and vehicles.

12M2O Lead Firefighter

The 12M2O Lead Firefighter serves as a lead firefighter in a Modular Ammunition Company. They have direct responsibility for managing and maintaining two fully equipped fire trucks and ten sets of firefighting gear with associated equipment valued at over $1.3 million. They are also responsible for developing, executing, and sustaining the proficiency of the company’s firefighting section through training. Additionally, they provide overall management, supervision, training, professional development, and ensure the health and welfare of six soldiers.

Senior Firefighter

The Senior Firefighter is responsible for overseeing firehouse operations. They maintain personnel training and qualifications, educating base agencies on risks and fire resources. They conduct fire prevention operations, including routine inspections and pre-fire planning. The Senior Firefighter analyzes vulnerabilities and hazards, developing plans to mitigate potential damage. They coordinate with all agencies to identify hazardous materials and risks, and prepare for hazardous materials emergency response. Additionally, they test hydrant and alarm systems and conduct initial fire investigations.

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