Marine Infantry Guide

Marine Infantry MOS Guide

The United States Marine Corps operates its own infantry unit with an outstanding reputation.

Marine Infantry (Field 03) is the backbone of the military branch with a primary goal of seizing and controlling terrain.

The infantry division features several different Military Occupational Specialties (MOS).

Regardless of the MOS, Marines serve the country attacking and defeating enemy forces.

Read the complete Marine Infantry Guide for more information on the job field and related specialties.

Related Article:  Marine Corps Height And Weight Standards

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What is the Marine Infantry?

marine corps jobs
Marine Infantry secures and defends terrain by locating, converging, and destroying enemy forces. Image: Wikimedia Commons

Marine Infantry represents the 03 Occupational Career Field in the United States Marine Corps.

The infantry units serve as ground forces that are capable of locating, converging, and destroying enemy forces.

Marine Infantry may secure and defend terrain by repelling an enemy assault by fire, maneuver, and close combat.

The Infantry division trains amphibious warriors that have the ability to deliver versatile warfare in chaotic and uncertain conditions.

Marines employ a variety of weapons and systems to complete a mission.

Thanks to incredible training and support, Marines can fight in any climate or place, day or night.

Marines depend on crucial communication links and supporting arms (artillery, naval gunfire, close air support, etc) to finish the task at hand.

Therefore, Marines utilize a full spectrum of combat with the ability to maneuver by foot or mounted trucks, assault vehicles, or vertical assault aircraft.

Marine Infantry warriors are part of one of the most highly trained and deadliest fighting forces on planet earth.

The infantry division is highly coveted by recruits from every military branch because of all the specialized training as well as prestige.

You’ll serve the country as a Combat Infantry Marine that uses hand-to-hand combat or acts as part of a fire team.

Marine Infantry Jobs

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Marine Infantry represents more than a dozen jobs in Occupation Field 03. Image:

Marine Infantry provides combat roles designed to seize and occupy terrain which is needed to win battles, and therefore wars.

They receive highly specialized training to reach enemy terrain by way of the sea and assert their will on the battlefield.

As a result, Marine Infantry provides some of the best trained and elite combat personnel of any branch in the military.

Marines are traditionally the first on the scene and help pave the way for other support units.

There are several Marine Infantry jobs (Job Field 03) that you should consider pursuing:

Rifleman (MOS 0311)

Marine rifleman (mos 0311) doing what he does best. Image:

Marine Rifleman MOS 0311 is one of the most common Marine Infantry positions in the Corps.

Marines typically start out as Rifleman before progressing to more advanced roles such as Scout or Recon.

Riflemen prepare to become primary scouts and serve close combat forces for any available unit, including Marine Air-Ground Task Force (MAGTF).

Marine Riflemen depend on M16A4 service rifle, M4 carbine, M203 grenade launcher, and M249 SAW for a defense arsenal.

Marine MOS 0311 represents the foundation of Infantry and the nucleus of the fire team.

Riverine Assault Craft (MOS 0312)

Riverine Assault Craft is responsible for transporting Marines from ship to shore using a variety of small boat craft.

Therefore, Marine MOS 0312 either serves Infantry as a coxswain for the RRAC crewman or capable of handling onboard weapons systems.

The onboard weapons systems include powerful weapons such as the MK-19 Grenade Launcher and M2 Machine.

LAV Crewman (MOS 0313)

0313 mos marines
Marine Corps LAV Crewman (MOS 0313) are trained to operate and gun light armored vehicles (LAVs) which are older, yet still dependable. Image: Wikimedia Commons

LAV Crewmen are responsible for the Ligh Armored Vehicle (LAV).

Therefore, LAV Crewmen are skilled in Armored Reconnaissance.

Marine MOS 0313 provides basic infantry skills as well as a variety of weaponry.

You may serve the team as vehicle operators or commanders of Ligh Armored Vehicles.

Rigid Raiding Craft (MOS 0314)

Marine Rigid Raiding Craft is a coxswain that is responsible for the safety and conduct of the boat team.

They provide safe operation, launch, recovery, and maintenance of the craft.

Marine MOS 0313 also deals with associated SL-3 equipment and components.

Combat Rubber Reconnaissance Craft (MOS 0316)

Marine Combat Rubber Reconnaissance Craft (CRRC) is responsible for the safety and conduct of a boat team.

The coxswain provides the safe operation, handling, launch, recovery, and maintenance of the CRRC craft.

It also deals with associated equipment, components, and SL-3 gear.

Scout Sniper (MOS 0317)

marine scout sniper
The Marine Corps is rare in that it combines two responsibilities (sniping and reconnaissance) in the role of MOS 0317. Image: Department of Defense

A Marine Scout Sniper is one of the more prestigious job titles within Occupation Field 03.

The military role requires high levels of marksmanship and field training of long-range precision fire.

Scout Snipers are also capable of providing reconnaissance and surveillance operations for the infantry battalion.

Marine 0317 needs to graduate from the esteemed Marine Corps Scout Sniper School before earning the job designation.

They also need to have a minimum rank of Lance Corporal.

Reconnaissance Man (MOS 0321)

marine recon 0321

A Marine Reconnaissance Man is skilled in amphibious recon and ground recon.

Reconnaissance Men also have proficiency in scout swimming, small boat operations, and refined observation.

They can scout, patrol, and produce long-range communications skills to assist with reconnaissance.

The Marine Corps presents advanced training as a static line and military freefall parachutists and jumpmasters under the job designation.

Marines may also train as combatant divers and diving supervisors.

Reconnaissance Man – Parachute Qualified (MOS 0323)

Marine Recon with a parachute qualification fall under the Military Occupational Specialty MOS 0323.

Reconnaissance Man – Parachute Qualified is highly trained and skilled in amphibious as well as ground reconnaissance.

There is an extra emphasis on parachute jumping and landing in MOS 0323.

Related Article:  7 Benefits Of Joining The Marine Corps

Reconnaissance Man – Combatant Diver Qualified (MOS 0324)

Marine Recon with a combatant diver qualification falls under the Military Occupational Specialty MOS 0324.

Reconnaissance Man – Combatant Diver Qualified is trained in the same amphibious and ground reconnaissance as MOS 0321 and MOS 0323.

Marine MOS 0324 specializes in diving as a means for executing specialized missions.

Reconnaissance Man – Parachute and Combatant Diver Qualified (MOS 0326)

Marine MOS 0326 combines the best of both worlds with parachute and combatant diver qualifications.

Therefore, Recon Men MOS 0326 are highly trained and versatile warriors.

They can utilize either parachuting or diving to execute recon missions for the Marine Corps.

Machine Gunner (MOS 0331)

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Marine Corps 0331 firing a M249 light machine gun. Image:

Marine Corps Machine Gunner (MOS 0331) is a highly valued Military Occupational Specialty.

Machine Gunners handle large machine guns in direct combat.

They provide direct fire support for the infantry squad/platoon/company.

Machine Gunners handle heavy weapons such as the 7.62mm medium machine gun, as well as 50-caliber and 40mm heavy machine gun.

Marine MOS 0331 is a hard-working and challenging job specialty yet very rewarding.

Mortarman (MOS 0341)

usmc mortarman
Mortarman (MOS 0341) provide indirect fire support for other Marines on the ground. Image:

Marine Mortarman (MOS 0341) is responsible for the tactical employment of the M224, 60mm Light Mortar and M252, and 81mm Medium Mortar.

Mortarmen offer indirect fire in support of the rifle and LAR squad/platoon/company.

The Marines may assign Mortarmen as Gunners, Forward Observers, Fire Direction Plotters, and squad leaders.

Infantry Assaultman (MOS 0351)

Marine Corps Infantry Assault - MOS 0351
Marine Corps Infantry Assault (MOS 0351). Image:

A Marine Infantry Assaultman (MOS 0351) acts on the front line of any infantry assignment.

An Assaultman (MOS 0351) are considered “grunts” which is a term they honor and take very seriously.

However, Marines are more than just laborers as they use highly advanced weapons and are very well trained.

Infantry Assault Marines employ rockets, APOBS, and demolitions to support the infantry squad or platoon.

Anti-Tank Missileman (MOS 0352)

Marine Corps Antitank Missileman - Tow Gunner - MOS 0352
Antitank Missileman – Tow Gunner (MOS 0352). Image:

The Marine Corps continues to introduce some of the most sophisticated weapons systems in the world.

Therefore, they need specialized Marines like MOS 0352 to handle high-powered weapon systems.

It takes special training and a team of experts to utilize anti-tank missiles on enemy targets.

Marine Anti-Tank Missilemen provide tactical employment of medium and heavy anti-armor fire in support of the infantry squad and platoon.

Infantry Unit Leader (MOS 0369)

Marine Infantry Unit Leaders earn their rank and respect of fellow troops.

Infantry Unit Leaders plan and assign missions.

They carry out orders that get issued by the Platoon Commander.

Leaders are responsible for the welfare and discipline of the squad, equipment, and weapons to which they get assigned.

Marine Special Operations Command Critical Skills Operator (MOS 0372)

Marine Corps Critical Skills Operator - MOS 0372
Marine Corps Critical Skills Operator (MOS 0372). Image:

Marine Command Critical Skills (CSO) Operators are highly trained operatives.

They execute missions in the elite levels of Special Ops and Counter-terrorism.

Marine CSO Operators (MOS 0372) receive training across multiple infantry fields.

They are experts on reconnaissance and have earned a stellar reputation within Occ-Field 03 of the Marine Corps.

Related ArticleMarine Corps MOS List: Details on all 123 jobs

Marine Infantry Requirements

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The infantry division of the Marine Corps requires you to meet minimum scores on the ASVAB and physical fitness standards. Image: Wikimedia Commons

Marine Infantry has a series of requirements that recruits need to meet before qualifying for initial training.

The Marine Corps has basic requirements for admission, including physical fitness standards.

Additionally, prospective recruits need to complete the Armed Services Vocational Aptitude Battery (ASVAB).

The series of tests determine what your strengths and weaknesses are through a written exam.

Marine Infantry candidates must score General Technical (GT): 80 or higher on the ASVAB.

Related Article: ASVAB Scores For All 120+ Marine Corps Jobs

Basic training (or boot camp) in the Marine Corps is 13 weeks and demanding.

You also need to attend and complete the School of Infantry (SOI).

Marine Corps School of Infantry is a physically and mentally demanding program.

You will complete the Marine Rifleman Course during your studies which include classroom learning and field training.

All in all, Marine SOI lasts nearly two months and challenges you while serving in an Infantry Training Battalion (ITB).

The goal is to complete Marine SOI by focusing on physical fitness and mental toughness.

Marine Infantry is not for everyone and requires a high degree of focus and commitment.

Your dedication and performance during recruit training can help you pave any career you wish to pursue in Marine Infantry.

Marine Corps Command Structure

marine mos list
The Marine Corps has a specific command structure for its Infantry Division, just like other military departments. Image: Marine Forces Reserve

The United States Marine Corps is organized within the Navy.

The U.S. Navy is led by the Secretary of the Navy (SECNAV).

A Commandant of the Marine Corps acts as the most senior commissioned officer in the military branch.

The Commandant of the Marine Corps is responsible for organizing, recruiting, training, and equipping the branch.

Secondly, the Marine Corps gets organized into four subdivisions:

  • Headquarters Marine Corps
  • Operating Forces
  • Supporting Establishment
  • Marine Forces Reserve

Furthermore, the Marine Corps divides the Operating Forces into three separate subdivisions:

  • Unified Combatant Commands
  • Marine Corps Security Forces
  • Marine Security Guard

Operating Forces get divided into Marine Forces Command (including II Marine Expeditionary Force) and Marine Forces Pacific (including I Marine Expeditionary Force and III Marine Expeditionary Force).

Related ArticleMarine Corps Military Police (MOS 5811): Career Details

Marine Infantry Command Structure

The basic organization of Marine Infantry follows the “rule of threes”.

Consequently, it places three subordinates under a commander but that doesn’t count the support elements.

Here is the organization starting with the lowest member on the totem pole and working the way up the hierarchy:

  • Fire Team: Consists of four Marines including a Team Leader, Rifleman, and two Automatic Riflemen.
  • Rifle Squad: The squad is led by a Sergeant with three identical fire teams.
  • Rifle Platoon: The platoon is commanded by a 2nd or 1st Lieutenant with three rifle squads and a headquarters element.
  • Weapons Platoon: The platoon is generally commanded by a 1st Lieutenant and assisted by a Gunnery Sergeant. The platoon includes three different sections: 60mm Mortar Section, Assault Section, and Medium Machine Gun Section.
  • Rifle Company: The company is commanded by a captain and assistant. It consists of three rifle platoons, weapons platoon, and company headquarters.
  • Infantry Battalion: The battalion is commanded by a Lieutenant Colonel and consists of three rifle companies, a weapons company, and a headquarters company.
  • Infantry Regiment: The regiment is commanded by a Colonel and consists of three battalions and regimental headquarters company.
  • Marine Division: The division is commanded by a Major General (CG) and assisted by the Brigadier General. It consists of three infantry regiments, an artillery regiment, and several individual battalions.

Marine Infantry Units

Marine Infantry includes ground combat element (GCE) which consists of combat and combat support units.

Infantry battalions are the heart and soul of the Marine Corps ground combat element.

Marine infantry battalions are generally referred to as “grunts”.

The battalion is traditionally organized into three rifle companies, a weapons company, and a headquarters and service company.

Here is the complete list of active Marine infantry units:

  • 1st Battalion, 1st Marines (California)
  • 2nd Battalion, 1st Marines (California)
  • 3rd Battalion, 1st Marines (California)
  • 1st Battalion, 2nd Marines (North Carolina)
  • 2nd Battalion, 2nd Marines (North Carolina)
  • 3rd Battalion, 2nd Marines (North Carolina)
  • 1st Battalion, 3rd Marines (Hawaii)
  • 2nd Battalion, 3rd Marines (Hawaii)
  • 3rd Battalion, 3rd Marines (Hawaii)
  • 1st Battalion, 4th Marines (California)
  • 2nd Battalion, 4th Marines (California)
  • 3rd Battalion, 4th Marines (California)
  • 1st Battalion, 5th Marines (California)
  • 2nd Battalion, 5th Marines (California)
  • 3rd Battalion, 5th Marines (California)
  • 1st Battalion, 6th Marines (North Carolina)
  • 2nd Battalion, 6th Marines (North Carolina)
  • 3rd Battalion, 6th Marines (North Carolina)
  • 1st Battalion, 7th Marines (California)
  • 2nd Battalion, 7th Marines (California)
  • 3rd Battalion, 7th Marines (California)
  • 1st Battalion, 8th Marines (North Carolina)
  • 2nd Battalion, 8th Marines (North Carolina)
  • 3rd Battalion, 8th Marines (North Carolina)
  • 1st Battalion, 23rd Marines (Texas)
  • 2nd Battalion, 23rd Marines (California)
  • 3rd Battalion, 23rd Marines (Louisiana)
  • 1st Battalion, 24th Marine (Michigan)
  • 2nd Battalion, 24th Marine (Illinois)
  • 1st Battalion, 25th Marine (Massachusetts)
  • 2nd Battalion, 25th Marine (New York)
  • 3rd Battalion, 25th Marine (Ohio)

Marine Infantry Pay

marine infantry mos
Marines make good money serving on the frontlines and also receive excellent benefits. Image: Flickr

Marine Infantry operates on the same pay scale as other divisions of the military.

Enlisted Marines are paid based on military rank and years of service:

InsigniaPay GradeRankAbbreviation2023 Minimum Monthly Pay
E-1 +4 monthsPrivatePvt$1,917.60
E-2Private First ClassPFC$2,149.20
E-3Lance CorporalLCpl$2,259.90
E-6Staff SergeantSSgt$2,980.50
E-7Gunnery SergeantGySgt$3,3445.80
E-8Master SergeantMSgt$4,957.20
E-8First Sergeant1stSgt$4,957.20
E-9Master Gunnery SergeantMGySgt$6,055.50
E-9Sergeant MajorSgtMaj$6,055.50
E-9Sergeant Major Of The Marine CorpsSgtMaj$6,055.50

Marine Officers receive pay based on the same criteria yet from a different pay scale:

InsigniaPay GradeRankAbbreviation2023 Minimum Monthly Pay
O-1Second Lieutenant2ndLt$3,637.20
O-2First Lieutenant1stLt$4,190.70
O-5Lieutenant ColonelLtCol$6,393.30
O-7Brigadier GeneralBGen$10,113.00
O-8Major GeneralMajGen$12,170.70
O-9Lieutenant GeneralLtGen$17,201.40
marine corps general insigniaO-10GeneralGen$17,675.10

Marines also earn several benefits like health insurance, paid time off, and housing/food assistance.

Frequently Asked Questions (FAQ)

marine corps infantry mos
Marine Infantry are fearless warriors that go into chaotic circumstances to help keep the nation safe. Image:

Here are some frequently asked questions about Marine Infantry:

Related ArticleMarine Corps Critical Skills Operator (MOS 0372): 2019 Career Details

Do infantry Marines see combat?

Yes, Marine Infantry acts as the front line of combat.

They are often the first to raid a foreign territory and seize control of the land.

The Marines will teach you all the skills and training you need to survive.

Regardless, all the MOS under Occ-Field 03 is dangerous because you do see combat.

Are all Marines considered infantry?

The short answer is yes and no.

There are Military Occupational Specialties (MOS) that are non-combat or non-infantry.

Infantry Marines attend the School of Infantry (SOI) while non-infantry attend separate training.

Regardless, it is the philosophy of the Marine Corps to train every recruit into a Rifleman.

So, you will receive combat training yet might not see any action during your duty.

How dangerous is infantry in the Marines?

Marine Infantry is dangerous because you are trained to see combat and usually represent the first point of attack.

There is the added danger of vertical envelopment and amphibious warfare which makes Marine Infantry arguably more dangerous than other military branches.

However, everyone that enlists in the Armed Forces (regardless of the branch) understands that some danger is involved with combat specialties.

Can females join infantry in the Marines?

As of 2016, all Marine MOS’s (including infantry MOS’) are open and available to women. With that said, there are a very small number who have actually done so (less than 100).

Is it hard to get infantry in the Marines?

The standards to become Marine Infantry are not extremely difficult.

However, the Marine Corps is often considered a more elite branch of the military because of the amphibious warfare tactics and the first line of response.

The School of Infantry (SOI) is more demanding compared to basic training yet with hard work and dedication you can advance.

A local Marine Corps recruiter can help you prepare for the infantry division before you arrive at SOI.

What’s a typical day in the life of a Marine Infantryman?

A typical day in the barracks starts early in the morning.

Marines wake up, shower, eat morning chow, and prepare for the day.

The School of Infantry (SOI) introduces you to the life of an Infantryman.

You will train during long days until you are sent out on an assignment.

Marines are very disciplined and undergo extremely intense and demanding training sessions.

Related ArticleMarine Corps Basic Training Guide


Marine Infantry is the backbone of the military branch.

The Infantry division produces amphibious warriors that offer versatility in warfare.

They assist in protecting the nation by attacking and seizing control of land during chaotic and uncertain conditions of conflict and crisis.

Rob V.
Marine Infantry

Marine Infantry

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Learn more about Marine Infantry, including the various jobs in Infantry, the requirements to join, command structure, pay, and more.
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