The FY27 MOS Manual (NAVMC 1200.1M) was approved 2 March 2026 and takes effect 1 October 2026. It creates new officer and enlisted MOSs, deletes one enlisted MOS, renames MOSs across multiple occupational fields, and updates requirements and prerequisites across most of the occupational field list. This applies to the Total Force, which means SMCR, IMA, and IRR Marines are included.
★ Affects all reservists: If your MOS is in a field with changes, your unit's reporting senior must process any required conversions or updates by 1 October 2026.
Who it affects
Every Marine in the Total Force. The changes are heaviest in certain occupational fields, but requirement and prerequisite updates touch officer and enlisted OccFlds 01 through 88 across the board. The one group with the most urgent concern: Marines holding MOS 2146 (Heavy Ordnance Vehicle Repairer/Technician), which is being deleted entirely.
Specific changes by category:
- New officer MOSs: OccFlds 05, 17, 59, 80, 88
- New enlisted MOSs: OccFlds 05, 13, 17, 59, 81
- Deleted enlisted MOS: 2146 (Heavy Ordnance Vehicle Repairer/Technician)
- Officer MOS title changes: OccFlds 02, 06, 26, 30, 75, 80, 82 (no grade structure changes)
- Enlisted MOS title changes: OccFlds 06, 13, 28, 63, 82, 86
- Enlisted grade structure changes: OccFld 06
- Enlisted category status changes: OccFld 06
- Summary, requirements, or prerequisite changes: OccFlds 01, 02, 03, 04, 05, 06, 08, 09, 11, 13, 17, 18, 21, 23, 26, 27, 28, 30, 33, 34, 41, 44, 45, 55, 57, 59, 60, 61, 62, 63, 64, 65, 66, 68, 70, 72, 73, 80, 81, 82, 86, 88
What you need to do
For most reservists, this is awareness. Read the manual if your OccFld is on the list, know what changed, and confirm with your S-1 whether anything hits your record.
If you are a commanding officer or unit administrator:
- Pull the conversion tables in Chapters 2 and 4 of NAVMC 1200.1M and identify any Marines in your unit affected by changes.
- Process MOS conversions, deletions, or new MOS awards in MCTFS before 1 October 2026.
- Ensure Marines holding MOS 2146 are flagged for appropriate action coordinated through DC M&RA.
- Familiarize yourself and your staff with any system updates to MCTFS and Marine Corps Training Information Management System (MCTIMS) that reflect the new manual.
School directors: begin awarding updated MOSs on 1 October 2026. Obsolete MOSs will not be awarded after that date.
Key dates
- 2 March 2026: FY27 MOS Manual approved and posted
- 1 October 2026: Manual takes effect. Systems update, new MOSs are awarded, obsolete MOSs are retired, and unit COs must have all conversions processed.
The official version
MARADMIN 122/26 is the source. The full manual (NAVMC 1200.1M) and the updated MOS chart are posted at https://usmc.sharepoint-mil.us/sites/TECOM_PSD_MOSMan (CAC-required access likely).
POC for questions: Jay Coutu or Nashawn Norman at TECOM Quantico. Reach them at jay.coutu@usmc.mil or nashawn.norman@usmc.mil, or by phone at (703) 784-3252 and (703) 432-0071 respectively.
This is written by a reservist, for reservists. It is not an official publication of HQMC or MARFORRES. Always verify guidance with your command or unit S-1 before acting on any article or summary.