The United States Marine Corps is renowned for its elite infantry units, which form the backbone of the Corps' combat forces. Infantry Marines are trained to engage in a wide range of combat operations, from urban warfare to amphibious assaults. For those interested in pursuing a career as an infantry Marine, there are several jobs, or Military Occupational Specialties (MOS), to consider. These roles require a unique blend of physical toughness, mental agility, and tactical prowess.
Infantry Occupational Fields

The Marine Corps categorizes its infantry jobs into several occupational fields, each with its own set of specialties and responsibilities. The 0300 occupational field, for example, encompasses the bulk of infantry roles, including rifleman, machine gunner, and mortarman. These Marines are trained to engage enemy forces using a variety of weapon systems and tactics. The 0800 occupational field, on the other hand, includes jobs related to artillery and mortar operations, such as cannon crewman and mortar gunner.
Rifleman (MOS 0311)
The rifleman is the most common infantry MOS, and is responsible for engaging enemy forces using an M4 carbine or M16 rifle. Riflemen are trained in basic combat skills, such as marksmanship, first aid, and navigation, and are often the first to engage the enemy in combat. To become a rifleman, one must complete the Infantry Training Battalion (ITB) course, which includes training in combat tactics, weapons handling, and teamwork.
MOS | Job Title | Description |
---|---|---|
0311 | Rifleman | Engage enemy forces using an M4 carbine or M16 rifle |
0331 | Machinist | Operate and maintain machine guns, such as the M240 and M2.50-caliber |
0341 | Mortarman | Operate and maintain 60mm and 81mm mortar systems |

Specialized Infantry Roles

In addition to the traditional infantry MOS, there are several specialized roles that require advanced training and skills. These include the scout sniper, who is trained to conduct reconnaissance and engage high-value targets, and the reconnaissance Marine, who is trained to conduct amphibious and ground reconnaissance. These roles require a high level of physical fitness, as well as advanced skills in areas such as marksmanship, navigation, and surveillance.
Scout Sniper (MOS 0317)
The scout sniper is a highly specialized infantry role that requires advanced training in marksmanship, surveillance, and reconnaissance. Scout snipers are trained to conduct reconnaissance and engage high-value targets using a variety of weapon systems, including the M40 sniper rifle. To become a scout sniper, one must complete the Scout Sniper Basic Course, which includes training in advanced marksmanship, surveillance, and reconnaissance techniques.
Key Points
- Riflemen are the most common infantry MOS, and are responsible for engaging enemy forces using an M4 carbine or M16 rifle
- Scout snipers are highly specialized infantry Marines who are trained to conduct reconnaissance and engage high-value targets
- Reconnaissance Marines are trained to conduct amphibious and ground reconnaissance, and are skilled in areas such as navigation, surveillance, and communication
- Infantry Marines must be prepared to operate in a variety of environments, from urban cities to remote wilderness areas
- Advanced training and skills are required for specialized infantry roles, such as scout sniper and reconnaissance Marine
Infantry Training and Education
To become an infantry Marine, one must complete a rigorous training program that includes both classroom instruction and practical field training. The Infantry Training Battalion (ITB) course is the primary training program for infantry Marines, and includes training in combat tactics, weapons handling, and teamwork. Additionally, infantry Marines may receive advanced training in specialized skills, such as marksmanship, surveillance, and reconnaissance.
Infantry Training Battalion (ITB)
The ITB course is a 52-day training program that teaches infantry Marines the basic skills they need to succeed in combat. The course includes training in combat tactics, weapons handling, and teamwork, as well as physical fitness and leadership development. ITB is a challenging and demanding program that pushes Marines to their limits, both physically and mentally.
In addition to ITB, infantry Marines may also receive advanced training in specialized skills, such as marksmanship, surveillance, and reconnaissance. This training is designed to prepare Marines for the challenges of combat, and to give them the skills and knowledge they need to succeed in a variety of environments.
What is the most common infantry MOS in the Marine Corps?
+The most common infantry MOS in the Marine Corps is the rifleman (MOS 0311).
What is the role of a scout sniper in the Marine Corps?
+A scout sniper is a highly specialized infantry Marine who is trained to conduct reconnaissance and engage high-value targets using a variety of weapon systems.
What is the Infantry Training Battalion (ITB) course?
+The ITB course is a 52-day training program that teaches infantry Marines the basic skills they need to succeed in combat, including combat tactics, weapons handling, and teamwork.
In conclusion, the infantry is a vital component of the Marine Corps, and offers a range of challenging and rewarding career opportunities for those who are willing to push themselves to the limit. Whether you’re interested in becoming a rifleman, scout sniper, or reconnaissance Marine, the Marine Corps has a place for you. With its rigorous training programs and emphasis on teamwork and leadership, the Marine Corps is the perfect choice for those who want to serve their country and make a difference in the world.