Military Occupational Specialty
From Halopedia, the Halo wiki
Were you looking for Halopedia's Manual of Style?
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.
List of appearances