I think, you have to add this to the barracks of your faction:
Code:
Behavior = ProductionUpdate ModuleTag_xy
QuantityModifier = Yourmodelname 2
End
The "2" is the number of units come out of the barracks after recruiting.
Replace "Yourmodelname" with the name of the unit you want to affect with this, i.e. GLAInfantryRebel
Greets
G.S.