List of U.S. military vehicles by supply catalog designation

This is a List of U. S. military vehicles by supply catalog designation. The U.S Army Ordnance Corps Supply Catalog used a nomenclature system that designated G-series numbers to represent various U.S. military vehicles. Generally, the G-series group together a "family" of vehicles that are 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.

Note, these are largely unused, or unknown.

...
Wikipedia