It's the kinetic energy of a HEAT round that damages a tank too, but that's not classified as a KEW either, since a KEW is where the sole damage done is by the

It's the kinetic energy of a HEAT round that damages a tank too, but that's not classified as a KEW either, since a KEW is where the sole damage done is by the energy of a projectile (and a HEAT round it's the chemical energy in the round that produces most of the damage, after being converted to thermal and kinetic energy). I will propose that (generally speaking) a projectile has mass, which would exclude photons from the definition.