AT damage resistance

[thehitman009]

In the Bulls on Parade update, there was a tweak to AT gun damage resistance from tank rounds.

"Reduced damage taken by AT Guns from tank guns but still as many suppression (fire support vehicles/tanks still do as much damage)."

Which file implemented this? I have searched all over and can't find it. The general damage resistance would affect both tank and support tank HE similarly since both are HE, so I assume it's elsewhere.