I see, hmm after looking in the WWII folder for btimaps, i can see that corps, armies and anti tank units has 3 bitmaps but the look all alike and special forces 2 bitmaps.
If i would change the look of these, is it the infantry weapon research levels that control the changes of bitmaps and anti tank reserach for AT. So if you reach level 3,4 or 5 it still looks the same?