[Imp]

Okay well I have just had a quick look & it always used to be
I MG = size 0
2, 3 MGs =size 1

In MBT some do indeed seem tohave changed, British 2MG units for example but the Chinese still follow the old format.

In WW2 Germany & Russia still follow the old format & its easy to see in the German one as both single & double MG units are listed in the same formation.

On USA size zero units I cant remember but I think there may still be the odd Vietnam era patrol of 6 men that is size zero.
With Bradleys unless go the none AT option & size 6 squad you get an ATGM team & a 4man squad which is size zero.
I realise its a 4 man team so could qualify for size zero & certainly would as a scout but this means unless some other infantry squads are around your fighting nearly all size 0 infantry units with level 80 experience.
Very hard for the poor AI to even find a foot target.
Also Panzer Grenadiers could be represented the same way splitting into a small squad & ATGM team & getting size zero for both units instead of size one for the single unit.

Maybe its differences in training but to me the USA not only gets the flexibility of 2 separate units but gets both at size zero.
I admit that I would guess there roll is to protect the Bradley & help be its eyes rather than get into fire fights.
So an armoured formation supported by Bradleys has serious AT capability & no size 1 units unless some engineers or regular infantry come along for the fun effectively making every infantry unit a scout.