This review is part of a larger Marine Corps force redesign initiated in March 2020 which was initiated to help the Corps re-align for the future. On 15 October 2020, the Marine Corps announced a structured review of 67 Marine Corps MOSs. Not all instances of the word or word-part 'man' were removed, e.g., 0171 Manpower Information Systems (MIS) Analyst, 0311 Rifleman, 0341 Mortarman. On 30 June 2016, the Marine Corps announced the renaming of 19 MOSs with gender-neutral job titles, replacing the word or word-part 'man' with the word 'Marine' in most. 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. The USMC now publishes an annual Navy/Marine Corps joint publication (NAVMC) directive in the 1200 Standard Subject Identification Code (SSIC) series to capture changes to the MOS system. Job codes are identified in the last two digits and represent a specific job within that OccFld. Occupational Fields (OccFlds) are identified in the first two digits and represents a grouping of related MOSs.

Additional MOSs may be assigned through a combination of training and/or experience, which may or may not include completion of a formal school and assignment of a formal school code. All enlisted and officer Marines are assigned a four-digit code denoting their primary occupational field and specialty. The United States Marine Corps Military Occupational Specialty ( MOS) is a system of categorizing career fields. ( Learn how and when to remove this template message) This article may need to be rewritten to comply with Wikipedia's quality standards.

Mos definition