The ground forces of the Arckhadians needed a something that could replace theire old tanks, but they didnt know what to make. At first they wanted a walker like the AT-ST, but after a while they ended up with a replica of the old droid AAT. But when they first deployed them in battle, they quickly discoverd that the Republics AV units managed to destroy the AAT to fast and to easy. Soo they needed a even more armored tank. So the removed the turret and the entire upper part of the AAT and remade it. But the tank was made longer on the upper part and they lowerd the tank a good deal. And the turret was given a lager and much more powerful cannon. But when they used this new tanks for battle they quickly discoverd that they lacked a defensiv weapons. So they placed two cannon arms on the tank with turbolasers and proton torpedo. And the the nwe AAT was born. The Republic troops called this new tanks HAAT(Heay Armored Attack Tank).
This is a two man tank. 1 driver and 1 gunner. And there is a gunner in the turret to.