Military rating is a term used to describe the occupational specialty of an enlisted service member in the United States Navy. There are various synonyms of the term military rating, including job specialty, occupational code, rating code, and MOS code. The job specialty refers to the type of work a military member performs and is classified by a specific code. The occupational code is a numerical or alphanumeric code that identifies the specific job duties of a service member. The rating code is a military code used by the Navy to identify the specific skills and knowledge required for a particular job. Lastly, the MOS code is a military occupational specialty code used by the Army and Marine Corps to identify skillsets of service members.