The All Terrain Anti-Aircraft, or AT-AA, was a fast, four legged Anti-Aircraft Unit used by the Empire.
Star Wars: Empire At War/Forces of CorruptionEdit
In this game, a squadron of 3 AT-AAs can be purchased by the Empire at Tier 2 and 3 at the Light Factory for 675 credits. It is relatively fast and has modest anti-infantry damage, but its main use is to shoot down the rebel Speeders, which will appear at this stage. As such, they're a necessity, as no other unit besides the static Anti-Aircraft Turrets can destroy them.
At Tier 3, the AT-AA can also shoot down the Y-wings before they get the chance to start their highly damaging Bombing Run, as well as being essential to protect AT-ATs from the Speeders' cable attack. Finally, this unit's special ability is to release a pulse of energy that will drastically reduce the effectiveness of missiles in the affected area, thus decreasing the threat of Missile Attack Launchers, Plex Missile Soldiers and T4-B Heavy Tanks' missile mode. Because this ability has a somewhat limited range and doesn't stack, it is wise to separate the squadron in larger forces, to ensure that all units are protected.