Here are the rules as we use them.
Two quick points of note
We have a category of fearless this is for troop types who specialise in close combat, thus they activate well but ranged ability is reduced. ie Warzone Sunset Strikers.
We do not use suppresion as such but the wound system gives a similar effect
The artillery section is still under testing and as such is untested.
As these rules are based on those from another source on the Fubar forum, I shall not take the credit for them but note they are open for editing so feel free to tweak.
Updated with Artillery idea