Military Numbering System
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Prefixes:

_-xx

1- Heavy Armor
2- Medium Armor
3- Light Armor
4- Utility
5- Medical
6- VTOL/Air
7- Experimental

Main:

x-_ _

The first numeral is the Model type of that vehicle, second numeral is the version of that specific model.

Example: 7-2A

Is a Experimental type, 2nd Model type, 1st Version.