OCC Field 03Marine Corps photo by Cpl. Luke Hoogendam. Released for public use.

MOS OCC Field 03: Infantry

For additional information, see the official Department of the Navy Headquarters Marine Corps MOS Manual:
Click here, 851 page PDF opens in a new window. Your Place to Connect & Share® with other family members with a Marine in these MOS Schools is our Official MarineParents.com MOS Facebook Group.
INFANTRY: OCCUPATIONAL FIELD 03
Specialty School Location FB Page FB Page2
0311 Infantry Marine
The Marine infantry rifleman spends countless hours becoming specialists on various weapons systems, understanding survival techniques, and living in the field for weeks on end. They are the backbone of the Marine Corps and are the image that most people think of when they think of Marines.
Camp Pendleton, CA N/A N/A
0311 Infantry Marine
The Marine infantry rifleman spends countless hours becoming specialists on various weapons systems, understanding survival techniques, and living in the field for weeks on end. They are the backbone of the Marine Corps and are the image that most people think of when they think of Marines.
Camp Lejeune, NC N/A N/A
0313 Light Armored Reconnaissance Marine
Provides driving and 1st echelon repairs for light armored vehicles. LAR crewmen are usually attached to light armored reconnaissance battalions. Additionally, LAR crewmen may be tasked with operating weapons systems onboard any LAV.
Camp Pendleton, CA FB Group FB Group 2
0321 Reconnaissance Man
Marine reconnaissance men are elite warfighters that are training in reconnaissance, intelligence gathering, and unique fighting skills that may be considered unconventional. They are dedicated and hardworking Marines who deploy with a small team to remote areas in support of the mission of the Marine Corps.
Camp Pendleton, CA FB Group FB Group 2
0331 Machine Gunner
As the title implies, Marine machine gunners are specialists in all mounted machine guns in the Marine Corps arsenal. They are experts on the maintenance, maneuvering, mounting, and utilization of Marine Corps heavy machine guns.
Camp Pendleton, CA N/A N/A
0331 Machine Gunner
As the title implies, Marine machine gunners are specialists in all mounted machine guns in the Marine Corps arsenal. They are experts on the maintenance, maneuvering, mounting, and utilization of Marine Corps heavy machine guns.
Camp Lejeune, NC N/A N/A
0341 Mortarman
Mortarmen utilize mortars to provide indirect fire support to infantry battalions in the field. Mortarmen may be asked to hike into difficult to reach locations in order to provide the most accurate and readily available mortar fire when called upon.
Camp Pendleton, CA N/A N/A
0341 Mortarman
Mortarmen utilize mortars to provide indirect fire support to infantry battalions in the field. Mortarmen may be asked to hike into difficult to reach locations in order to provide the most accurate and readily available mortar fire when called upon.
Camp Lejeune, NC N/A N/A
0351 Infantry Assault Marine
These Marines use rockets and the Marine Anti-Personnel Obstacle Breaching tool to assist infantry battalions with route clearance, building clearance, and direct rocket fire on enemy positions.
Camp Pendleton, CA N/A N/A
0351 Infantry Assault Marine
These Marines use rockets and the Marine Anti-Personnel Obstacle Breaching tool to assist infantry battalions with route clearance, building clearance, and direct rocket fire on enemy positions.
Camp Lejeune, NC N/A N/A
0352 Anti-tank Missile Gunner
Antitank missile gunners are usually attached to armor/tank units where they will be the weapons specialists that are in charge of deploying antiarmor/antitank fire towards enemy tanks and vehicles. These Marines specialize in supporting infantry and LAR battalions in need of antiarmor attacks.
Camp Pendleton, CA N/A N/A
0352 Anti-tank Missile Gunner
Antitank missile gunners are usually attached to armor/tank units where they will be the weapons specialists that are in charge of deploying antiarmor/antitank fire towards enemy tanks and vehicles. These Marines specialize in supporting infantry and LAR battalions in need of antiarmor attacks.
Camp Lejeune, NC N/A N/A
0372 Critical Skills Operator
Critical skills operators are extremely mature Marines who have a long and outstanding track record of being reliable and dependable. They are specialists in multiple weapons systems, engineering and breaching tactics, communications skills, and have extremely thorough knowledge of special forces operations. These Marines are able to work with teams or by themselves in remote and isolated conditions.
Camp Pendleton, CA N/A N/A
Click the hashtag below for the Guide on this OCC in our Facebook Group.
#OccField03 includes the following MOS:
0311 Infantry Marine, MOS School:  Camp Pendleton, CA
0311 Infantry Marine, MOS School:  Camp Lejeune, NC
0313 Light Armored Reconnaissance Marine, MOS School:  Camp Pendleton, CA
0321 Reconnaissance Man, MOS School:  Camp Pendleton, CA
0331 Machine Gunner, MOS School:  Camp Pendleton, CA
0331 Machine Gunner, MOS School:  Camp Lejeune, NC
0341 Mortarman, MOS School:  Camp Pendleton, CA
0341 Mortarman, MOS School:  Camp Lejeune, NC
0351 Infantry Assault Marine, MOS School:  Camp Pendleton, CA
0351 Infantry Assault Marine, MOS School:  Camp Lejeune, NC
0352 Anti-tank Missile Gunner, MOS School:  Camp Pendleton, CA
0352 Anti-tank Missile Gunner, MOS School:  Camp Lejeune, NC
0372 Critical Skills Operator, MOS School:  Camp Pendleton, CA
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