 The Soviets also invested heavily in reactive armour, which allowed them some ability to control quality, even after production.The most common type of composite armour today is Chobham armour, first developed and used by the British in the experimental FV 4211 tank, which was based on Chieftain tank components.Chobham sandwiches a layer of ceramic between two plates of steel armour, which was shown to dramatically increase the resistance to HEAT projectiles, even in comparison to other composite armour designs.