What is the French 75AC?

[Schoenwulf]

Actually the symbol on the M6 is for a motorized AT gun. It was never actually, or intended to be, a tank destroyer

That clarifies it, as there didn't seem to be a lot of difference between the M6 and a "75AC". Both are 4-wheeled vehicles with little if any armor and a mounted AT gun, yet the M6 listed in the Special Rules as a TD. Since the French unit carries a larger bore weapon than most M6's did, it would seem like either the M6 should not have listed as a TD, or the 75AC should have been in that same classification.