The All Terrain Armored Heavy Transport (AT-AHT) was a walker in service with Darth Krayt's Galactic Empire and the Empire-in-exile that opposed it.
The walker was an improvement on the older AT-AT, with better armor for the head and main chassis as well as guns mounted on the passenger-section, above and to each side of the cockpit.
It was primarily used on worlds where conditions prevented the use of repulsorlift vehicles. It was used to break through enemy defenses and scatter enemy troops.
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