If a unit has a grenade launcher and is near of a camouflage net ("Camouflage Net", "Camouflage Net (Open)" and "Camouflage Vehicle Cover"), he launches HE grenades on the net if :
-the net is "Camouflage Net (CSAT)", "Camouflage Net (Open) (CSAT)" or "Camouflage Vehicle Cover (CSAT)" and if the unit belongs to NATO
-the net is "Camouflage Net (NATO)", "Camouflage Net (Open) (NATO)" or "Camouflage Vehicle Cover (NATO)" and if the unit belongs to CSAT
It happens with the AAF nets too, depending of what faction they are friendly to.