About special "Mass Destruction"

It says destroy ground and waterbourne targets using bomber of rank III, which i did using Ju-87 D5. However it seems while destroying lot of AA and howitzers the counter does not go on. Aren’t they considered ground targets?

Well, the Ju-87 D5 is rank II, maybe that’s why…


Besides why is there a rank III limit?

I play sweden and many good vehicles for meis rank II

Fench SB2c or UK Brigand. Enjoy

Chinese B-25 - which for unknown reasons is Rank III and has those lovely 0.50 cals…