This is the Group G series List of the United States military vehicles by (Ordnance) supply catalog designation, — one of the alpha-numeric "Standard Nomenclature Lists" (SNL) that were part of the overall List of the United States Army weapons by supply catalog designation, a Supply Catalog that was used by the United States Army Ordnance Department / Ordnance Corps as part of the Ordnance Provision System, from about the mid-1920s to about 1958. In this, the Group G series numbers were designated to represent "Tank / Automotive materiel" – the various military vehicles and directly related materiel. These designations represent vehicles, modules, parts, and catalogs for supply and repair purposes. There can be numerous volumes, changes, and updates under each designation. The Group G list itself is also included, being numbered G-1. Generally, the G-series codes tended to group together "families" of vehicles that were similar in terms of their engine, transmission, drive train, and chassis, but have external differences. The body style and function of the vehicles within the same G-number may vary greatly. (en)