Greetings. I am new to this forum and had a question pertaining to Service Specialty Numbers (predecessor of Military Occupational Specialties) used during the Second World War. Does anyone have a good reference that provides a listing? After going over a few thousand muster rolls, I have complied a list of quite a few of them, however there are some I wanted to verify and a lineal listing would be most helpful. Any help anyone could provide would be greatly appreciated.