Further advances in armour technology have given the armour of late 20th century tanks the estimated equivalent of over a meter of rolled homogeneous armour (the type of armour used before, now used for comparison between different armour designs). At the same time the weapon development allows for any equal adversary to destroy any target detected and tracked by the wide array of different sensors available. This means adding more armour would not increase protection to any significant degree, and thus current development is instead focused on a combination of remaining undetected, interfering with tracking and active counter-measures to neutralize the enemy weapon systems.