ARMOR-PIERCING AMMO says: "reduce the vehicle's armor by 1 as well as the benefits of thick/extra thick armor".
Thick Armor: After defence dice are rolled, change one defence dice into "6" result.
Extra Thick Armor :After defence dice are rolled, change two defence dice into "6" result.
Does this card means, reduce armor by 1 and Thick Armor can change "ZERO" defence dice and Extra Thick Armor can change "ONE" defence dice?