All Terrain Anti-Aircraft

The All Terrain Anti-Aircraft (AT-AA) was a quick-moving, quadrupedal, mobile anti-aircraft walker used by the Galactic Empire.

Characteristics
The AT-AA had four stubby legs and lizard-like locomotion, along with a low profile not seen in other Imperial walkers. On most models, the only weapon was a turreted flak pod, capable of firing several types of ordnance.[3] Other versions could be equipped with one or three rocket-launching tubes.[2] Initially the AT-AA had an inability to fire at ground targets. This was partially rectified with the addition of gun ports to allow the crew to fend off infantry attacks.[2]

Some variation had flak pods replaced with concussion missile launchers.[2] The AT-AA also carried electronic countermeasure systems that could scramble missile guidance systems, thus lowering the risk of missile strikes.