The Armored Assault Tank (AAT-1 or AAT) was a medium-sized repulsor tank used mainly by the Trade Federation and the Confederacy of Independent Systems prior to the rise of the Galactic Empire. The tank had heavy frontal armor that gave it the capability to plow through walls, and it was heavily armed with a payload of 57 shells. The tank required a crew of four battle droids to be fully operated and was able to carry six additional battle droids onto the battlefield. The tank's reactor and power and communications gear were kept in the rear for protection.