Military Occupational Specialty

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- Veta Lopis

A Military Occupational Specialty (MOS) is a rating system used in the UNSC Armed Forces to describe and explain the job specialty of specific personnel. Different services, such as the Army, Air Force, Navy, Marine Corps, and Spartan Operations, use different ratings, but all have a system to classify personnel based on their occupation. Personnel typically wore an insignia on their uniform indicating unit and MOS.

Potential volunteers are recruited into service with the Marine Corps' Orbital Drop Shock Troopers because of the individual's performance within their chosen Military Occupational Specialty. According to Frederic-104, tracking is a basic component of any Spartan-II MOS. The daily training of all Spartan-IVs includes two hours of MOS training.

Army ratings

 * 18B: Primary MOS held by Emile-A239
 * 18E: Primary MOS held by Catherine-B320
 * 158B: Primary MOS held by SPARTAN-B312
 * 180A: Primary MOS held by Carter-A259
 * 180B: Primary MOS held by Jun-A266

Navy ratings

 * SO: Primary MOS held by Jorge-052

List of appearances

 * Halo: Last Light
 * Halo: Retribution