The United States Marine Corps is renowned for its elite infantry units, which form the backbone of its combat capabilities. As a branch of the military that prides itself on its warrior culture and esprit de corps, the Marine Corps offers a range of infantry jobs that cater to different skills, interests, and aptitudes. In this article, we will delve into the various Marine Corps infantry jobs, exploring their roles, responsibilities, and requirements.
Overview of Marine Corps Infantry Jobs

The Marine Corps infantry is divided into several Military Occupational Specialties (MOS), each with its unique responsibilities and challenges. From rifleman to reconnaissance, these MOSs require individuals who are physically and mentally tough, able to think on their feet, and work effectively in high-stress environments. The primary infantry MOSs in the Marine Corps include:
- Rifleman (0311)
- Heavy Machine Gunner (0331)
- Mortarman (0341)
- Infantry Assaultman (0351)
- Reconnaissance Man (8654)
Key Points
- The Marine Corps infantry is composed of various Military Occupational Specialties (MOS)
- Rifleman (0311) is the primary infantry MOS, responsible for engaging enemy forces
- Heavy Machine Gunner (0331) provides suppressive fire to support infantry operations
- Mortarman (0341) is responsible for indirect fire support using mortars
- Infantry Assaultman (0351) conducts breaching and demolition operations
Rifleman (0311)
The Rifleman is the most common infantry MOS in the Marine Corps. These individuals are responsible for engaging enemy forces using a variety of weapons, including the M4 carbine and M249 light machine gun. Riflemen are expected to be proficient in marksmanship, first aid, and basic combat skills. They work closely with other infantry units to achieve tactical objectives and are often the first point of contact with enemy forces.The role of the Rifleman is physically and mentally demanding, requiring individuals to operate in a fast-paced, dynamic environment. Riflemen must be able to think critically and make quick decisions in high-stress situations, often with limited information. To become a Rifleman, individuals must complete the Marine Corps' Infantry Training Battalion (ITB) and demonstrate proficiency in the skills and knowledge required for the MOS.
Heavy Machine Gunner (0331)
The Heavy Machine Gunner is responsible for providing suppressive fire to support infantry operations. These individuals operate the M2.50-caliber machine gun, which is capable of delivering high volumes of firepower over long distances. Heavy Machine Gunners work closely with Riflemen and other infantry units to provide covering fire and protect friendly forces from enemy attack.MOS | Description | Required Skills |
---|---|---|
0311 | Rifleman | Marksmanship, first aid, basic combat skills |
0331 | Heavy Machine Gunner | Machine gun operation, maintenance, and repair |
0341 | Mortarman | Indirect fire support, mortar operation, and maintenance |
0351 | Infantry Assaultman | Breaching and demolition, explosive ordnance disposal |

Reconnaissance and Specialized Infantry Jobs

In addition to the primary infantry MOSs, the Marine Corps also offers specialized jobs that require unique skills and training. These include:
- Reconnaissance Man (8654)
- Scout Sniper (8541)
- Explosive Ordnance Disposal (EOD) Technician (2336)
Reconnaissance Marines are responsible for conducting reconnaissance and surveillance operations to gather intelligence on enemy forces. These individuals must be able to operate in small teams, often behind enemy lines, and use specialized equipment such as binoculars, cameras, and sensors to gather information. Scout Snipers are trained to conduct precision firepower and reconnaissance operations, using advanced marksmanship skills and specialized equipment such as sniper rifles and spotting scopes.
Training and Requirements
To become a Marine Corps infantryman, individuals must complete a range of training programs, including:- Boot Camp: 13 weeks of basic training that teaches fundamental skills such as marksmanship, first aid, and basic combat skills
- Infantry Training Battalion (ITB): 52 days of advanced training that teaches specialized skills such as rifle marksmanship, machine gun operation, and mortar operation
- Marine Combat Training (MCT): 29 days of training that teaches advanced combat skills such as urban warfare, counterinsurgency, and combat patrolling
In addition to these training programs, infantrymen must also meet certain physical and mental requirements, such as passing the Physical Fitness Test (PFT) and meeting the minimum scores on the Armed Services Vocational Aptitude Battery (ASVAB) test.
What is the most challenging part of being a Marine Corps infantryman?
+The most challenging part of being a Marine Corps infantryman is the physical and mental demands of the job. Infantrymen must be able to operate in a fast-paced, dynamic environment, making quick decisions and reacting to changing situations. They must also be able to withstand the physical demands of combat, including carrying heavy loads and operating in extreme weather conditions.
What is the role of the Rifleman in the Marine Corps infantry?
+The Rifleman is the primary infantry MOS in the Marine Corps, responsible for engaging enemy forces using a variety of weapons. Riflemen work closely with other infantry units to achieve tactical objectives and are often the first point of contact with enemy forces.
What training programs must infantrymen complete to become qualified?
+Infantrymen must complete a range of training programs, including Boot Camp, Infantry Training Battalion (ITB), and Marine Combat Training (MCT). These programs teach fundamental skills such as marksmanship, first aid, and basic combat skills, as well as specialized skills such as rifle marksmanship, machine gun operation, and mortar operation.
In conclusion, the Marine Corps infantry jobs are challenging and rewarding, requiring individuals who are physically and mentally tough, able to think critically and make quick decisions in high-stress environments. From Rifleman to Reconnaissance Man, these MOSs offer a range of opportunities for individuals who are passionate about serving their country and protecting their fellow Marines. Whether you’re interested in engaging enemy forces, conducting reconnaissance, or providing suppressive fire, the Marine Corps infantry has a job that’s right for you.