is there a way to make a building combat-drop proof?
it seems that anything with a garrisoncontainer can be the target of a drop.

Probably, but I wouldn't know how.

Setting ImmuneToClearBuildingAttacks=Yes on the building's GarrisonContain module might do it--I've never tried. Of course, this would make the building immune to other garrison-clearing weapons as well.

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nope. tried that. i believe that china bunkers have immunetoclearbuilding but as far as im aware you can in fact combat drop into them