The Heavy Armored Assault Tank was a model of tank used by the Trade Federation. It was the successor of the Armored Assault Tank. The Heavy AAT saw use throughout the Invasion of Naboo as heavy tanks for the Trade Federation along with its smaller cousins and predecessors.
Heavy AAT featured superior firepower and durability than the AAT. It was extremely effective against heavy Republic vehicles such as the AT-TE walker and Republic artillery.
The Heavy AAT also saw action during the Liberation of Spinnaker and Liberation of Harte Secur, (along with AATs), where these tanks were very effective against the Gungan units, destroying many of them, but, also many Heavy AATs were destroyed by the Gungan Grand Army.
Behind the scenesEdit
In Star Wars: Galactic Battlegrounds, OOM-9 uses a Heavy AAT during early levels, but later uses a standard AAT during the Battle of Naboo.