The Marine Corps updated the FY27 MOS Manual out of cycle to change how NMOS 6053, CH-53K Maintenance Specialist, is earned. OJT is no longer an approved pathway. Going forward, Marines must complete a formal transition course or the final course of a CH-53K initial accession pipeline. The change is effective now and supports the service-wide transition from the CH-53E to the CH-53K.
Heads up: OJT no longer qualifies you for NMOS 6053. You need a completed transition or initial accession course on record.
Who it affects
Marines in primary MOS 6113, 6153, 6173, or 6323 who are assigned to or transitioning to CH-53K platforms. This is a total force message, so it covers active component and reserve Marines alike. If you hold or are working toward NMOS 6053 at a CH-53K squadron, this applies to you.
What you need to do
If you are currently pursuing NMOS 6053, confirm you are enrolled in or have completed the correct formal course for your primary MOS. OJT alone will not get you there anymore. Talk to your unit training officer or S-1 if your pathway was OJT-based.
The required courses by primary MOS are:
| Primary MOS | Course | Course Code |
|---|---|---|
| 6113 and 6173 (transition) | CH-53K Mechanic Organizational Maintenance Course | M05P4I1 |
| 6323 (transition) | CH-53K Avionics Technician Organizational Maintenance Course | M05P401 |
| 6153 (transition) | CH-53K Airframe Mechanic Organizational Maintenance Course | M05P491 |
| 6113 (initial accession) | CH-53K Initial Accession Mechanic Pipeline Course | M05P591 |
| 6173 (initial accession) | CH-53K Marine Enlisted Aircrew Training Course | M0553E4 |
| 6323 (initial accession) | CH-53K Initial Accession Avionics Pipeline Course | M05P571 |
| 6153 (initial accession) | CH-53K Initial Accession Airframe Mechanic Pipeline Course | M05P581 |
Training coordinated and approved by DCA and DC T&E (Training and Education Command) can also qualify, but that is a command-level coordination, not something an individual Marine arranges on their own.
Key dates
- Effective immediately (MARADMIN published 22 Oct 26)
- This change will be formally incorporated into the FY28 MOS Manual; it is applied to FY27 by exception
The official version
Full details are in MARADMIN 518/26. The governing documents are NAVMC 1200.1M (FY27 MOS Manual) and NAVMC 3500.132 (MOS Manual Program Guidance).
POC questions:
- LtCol Matthew Migliori, ASB-33:
matthew.migliori@usmc.mil - MGySgt Pierre Sibblis, ASB-33:
pierre.sibblis@usmc.mil - Jay Coutu (GS-14), TECOM:
jay.coutu@usmc.mil
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.