NAVMC 1200.1L — Military Occupational Specialties Manual

NAVMC 1200.1L governs Marine Corps military occupational specialties, including their requirements, classification, and conversion guidance.

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  • Publication number: NAVMC 1200.1L
  • Title: MILITARY OCCUPATIONAL SPECIALTIES MANUAL
  • Date: 7 Mar 2025
  • Proponent: 01000 Military Personnel
  • Status: Current

View NAVMC 1200.1L on armypubs.army.mil


It contains officer and enlisted occupational systems, conversion guidance, and Navy officer and enlisted classification codes. It establishes MOS requirements, prerequisites, duties, and related military skills, and identifies changes to MOSs and occupational fields.

Applies to: This Manual is applicable to the Marine Corps Total Force.

Topics covered

  • Officer occupational system
  • Officer conversion guidance
  • Enlisted occupational system
  • Enlisted conversion guidance
  • Navy officer classification codes
  • Navy enlisted classification codes
  • Explosive ordnance disposal operations

Questions and answers

How are Marine Corps occupational specialties identified?

An MOS code has four digits and a descriptive title. (paragraph 2)

What does an MOS identify in tables of organization?

The MOS is used to identify skill requirements of billets in T/Os. (paragraph 2)

What is an occupational field in the Marine Corps occupational system?

The OccFld is a grouping of related MOSs. (paragraph 1)

What criteria are considered when establishing an MOS?

Criteria to be considered in establishment of an MOS include the number of Marines required in the specialty, combat or combat support relationship, rotation base, training requirements, specialty requirements/ prerequisites, promotion opportunity, and career pattern. (paragraph 2)

What training is required for Marine EOD divers?

Complete the Navy Scuba Diver Course (N2003E1) or the Navy Basic Scuba Diver Course (A-433-0123) at the Naval Dive and Salvage Training Center, Panama City, FL. (paragraph 4)

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