Prior to the publication of the June 1945, Manual of Military Occupational Specialties NAVMC 1008-PD, the Marine Corps generally followed the Army's system for classifying jobs for personnel. As stated in the manual, the Marine Corps often used Army publications [1] for determining military SSN's [2]. After the publication of this manual, it would be the sole reference for classifying military personnel in the Marine Corps. The Army Manual, TM-12 426 would still be used for civilian personnel.