BUR #19787 has been rejected.
create alias tank_destroyer -> self-propelled_artillery
create implication self-propelled_artillery -> motor_vehicle
create implication self-propelled_artillery -> military_vehicle
Wikipedia said
In the past, self-propelled artillery has included direct-fire vehicles, such as assault guns and tank destroyers...They are typically armed with a direct fire artillery gun, also known as a self-propelled anti-tank gun, or missile launcher, also called an anti-tank missile carrier...
Two tags for the exact same visually indistinct class of military vehicles, regardless of exact gun caliber. I think it's better to keep this tag apart from tank, because SP artilleries are still distinguishable by having larger guns, relative to their body size.
Even according to Wikipedia, this tag is applicable for vehicles with tank-like chassis that carries heavy weaponry such as self-propelled howitzer, self-propelled mortar, and rocket artillery.