List of United States Marine Corps MOS

The United States Marine Corps Military Occupational Specialty (MOS) is a system of categorizing career fields. All enlisted and officer Marines are assigned a four digit code denoting their primary occupational field and specialty.

Occupational Fields (OccFlds) are identified in the first two digits and represents a grouping of related MOSs. Job codes are identified in the last two digits and represent a specific job within that OccFld.

The USMC now publishes an annual NAVMC-type directive in the 1200 SSIC series to capture changes to the MOS system. Previous versions of MCO 1200.17_ series directives are cancelled, including MCO 1200.17E, the last in the series before beginning the annual NAVMC-type directive series.

On 30 June 2016, the Marine Corps announced the renaming of 19 MOSs with gender-neutral job titles, replacing the word or wordpart "man" with the word "Marine" in most. Importantly, not all instances of the word or wordpart "man" were removed (e.g., 0171 Manpower Information Systems (MIS) Analyst, 0311 Rifleman, 0341 Mortarman).

Restrictions on Officer MOSs include:

Below are listed the current authorized Marine Corps MOSs, organized by OccFld, then by specific MOS. Most MOSs have specific rank/pay grade requirements and are listed to the right of the MOS title, if applicable (see United States Marine Corps rank insignia), abbreviated from the highest allowed rank to the lowest. Officer ranks are noted as Unrestricted Line Officers (ULOs), Limited Duty Officers (LDOs), and Warrant Officers (WOs). Those MOSs which are no longer being awarded are generally kept active within the Marine's service records to allow Marines to earn a new MOS and to maintain a record of that Marine's previous skills and training over time.

There are three categories of MOSs:

There are six types of MOSs, divided into primary MOSs and non-primary MOSs. Primary MOSs are of three types:

There are also three types of non-PMOSs:

Reporting MOSs and billet designators are special MOSs.

Officers are selected for promotion for their potential to carry out the duties and responsibilities of the next higher grade based upon past performance as indicated in their official military personnel file. Promotions should not be considered a reward for past performance, but as incentive to excel in the next higher grade. Officers are not strictly promoted based upon their MOS; all MOS carried by an officer are considered during the selection board process.

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