What is the mos for a marine gunny Sgt?

The Military Occupational Specialty (MOS) for a Marine Gunnery Sergeant (Gunny) is typically 9999, which designates them as a staff non-commissioned officer. However, a Gunnery Sergeant usually holds a specific MOS related to their primary military job, such as infantry, aviation, logistics, or other fields. In their role, they serve as a key leader and mentor, responsible for training and overseeing junior Marines within their unit. The Gunny plays a critical role in mission planning and execution, leveraging their experience to guide operations.