Normandy 44 - Nationalities Not Used?

[MisterMark]

Been poking around the files for Normandy 44 and although the following nationalities have folders within the game file structure, there is no 'units.dat' file within the folders for the following nationalities:

Belgian
Commonwealth
East-German (Kriegsmarine)
Netherland
Polish


As I understand it, the 'units' file (usually can open with notepad) is the file that designates a particular units parameters/values if it's included in the OOB for a given scenario.

Based on that assumption, it seems these nationalities won't make an appearance or have a place in Normandy 44.  If that's true, then why are they even included? 

And if that assumption is incorrect, then why don't these nationalities have a 'units.dat' file within their folders like the other nationalities?

Much appreciated,

-Mark