The Marine MOS List is a detailed catalog that defines every Military Occupational Specialty within the United States Marine Corps. Each code describes a specific role, skill set, and career path for active duty and reserve Marines.
Understanding this list helps service members plan training, choose specialties, and align assignments with long term goals across infantry, logistics, aviation, and technical fields.
| MOS Code | Job Title | Branch | Typical Duty |
|---|---|---|---|
| 0311 | Infantry Rifleman | Infantry | Engage enemy forces, conduct patrols, and lead fireteams in ground operations. |
| 2131 | Combat Engineer | Engineers | Clear obstacles, conduct demolitions, and support mobility on the battlefield. |
| 0341 | Mortarman | Infantry | Deliver indirect fire support using mortars to suppress enemy positions. |
| 0811 | Field Artillery Officer | Artillery | Plan and coordinate fire missions, manage fire direction centers, and lead artillery units. |
| 0602 | Aviation Logistics Officer | Aviation | Oversee maintenance, supply, and readiness of aviation assets and personnel. |
Core Infantry Military Occupational Specialties
Rifle and Light Infantry Roles
Infantry MOS codes such as 0311 and 0341 form the foundation of Marine Corps ground combat power. These roles emphasize marksmanship, maneuver tactics, and small unit leadership in direct contact with the enemy.
Marines in these positions often operate in fireteams and squads, requiring physical stamina, disciplined communication, and rapid decision making under stress.
Combat Engineering and Support Capabilities
Engineer Operations and Mobility Support
The Marine MOS list includes specialized engineering roles focused on overcoming physical barriers and protecting forces in complex terrain. Combat engineers handle route clearance, demolition, and construction during campaigns.
These specialists frequently work ahead of maneuver units to secure passages, reinforce structures, and deny enemy access to critical areas.
Artillery and Fire Support Systems
Indirect Fire and Fire Direction
Artillery MOS roles coordinate long range firepower, integrating sensors, communications, and fire plans to shape the battlespace. Officers and enlisted personnel manage fire direction centers and observe impacts in real time.
Effective fire support depends on precise targeting, synchronization with ground units, and adherence to rules of engagement.
Aviation and Technical Career Fields
Aviation Maintenance and Logistics
Within the aviation community, the Marine MOS list defines responsibilities for aircraft maintenance, supply, and safety compliance. Technicians and logistics officers ensure that helicopters and tiltrotors remain mission ready.
These roles blend mechanical expertise with operational planning to sustain aviation tempo and preserve aviation capabilities.
Strategic Career Planning with the Marine MOS List
- Study the official MOS list to identify roles that match your skills and long term objectives.
- Complete required training and certifications to qualify for higher responsibility positions.
- Align each assignment with opportunities for leadership, cross functional experience, and professional development.
- Maintain physical readiness and technical proficiency to remain competitive for selective specialties.
- Leverage mentorship and career counseling to navigate changes in force structure and new MOS pathways.
FAQ
Reader questions
How do I determine which MOS is the best fit for my qualifications and interests?
Review the official Marine MOS list with a career counselor, match your aptitudes and education to technical or combat roles, and consider long term promotion pathways before selecting a specialty.
What are the physical and academic requirements for different MOS categories?
Infantry and combat engineer roles typically require higher physical fitness standards, while aviation and logistics positions often emphasize technical test scores and maintenance aptitude.
Can an enlisted Marine laterally transfer to a different MOS within the same career field?
Yes, provided the Marine meets prerequisites such as time in grade, security clearance, and MOS specific training, lateral transfers are authorized through formal reclassification processes.
How does the Marine MOS list align with promotion opportunities and leadership tracks?
Certain MOS codes offer broader leadership pipelines and advanced schooling options, influencing eligibility for staff positions and higher rank responsibilities.