<Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (May 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (May 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> A United States military occupation code, or a military occupational specialty code (MOS code), is a nine - character code used in the United States Army and United States Marines to identify a specific job . In the United States Air Force, a system of Air Force Specialty Codes (AFSC) is used . In the United States Navy, a system of naval ratings and designators was used along with the Navy Enlisted Classification (NEC) system: however, on September 29, 2016, the United States Navy discontinued enlisted ratings after two hundred and forty - one years of use . Naval service members thereafter were to be referred to solely by their rank and would hold a Navy Operations Specialty (NOS) instead of a rate . </P> <P> Since an individual can obtain multiple job specialties, a duty military occupational specialty (DMOS) is used to identify what their primary job function is at any given time . An individual must complete and pass all required training for their military occupational specialty qualification (MOSQ). </P>

What is the meaning of m o s