Guys, don't know if this was reported already but something's wrong with the moveable AT-gun hitboxes. The "driver" of the AT-gun (the one standing erect and 'walking' it) will not be killed by anthing but a grenade/explosive. I've seen it multiple times that a bot walking an AT-gun just rushes (they go surprisingly fast) through a hail of fire, just passing by multiple tanks etc. and being able to reach and cap a flag behind the lines. it's impossible to hit these guys with regular rounds, be it regular tank-rounds, bullets or bayonets at point-blank, only a well-aimed grenade will do the job.
Sure way to reproduce: start a coop round on Battle of Keren, play as Brits and only cap the upper first flag, then wait for the counterattack (usually two tanks, followed by a kamikaze AT-gun, infantry depending on bot-count, I mostly play between around 20 and 32).