All Terrain Soup

All-Terrain-Walkers.

Star Wars's Imperial Military and the Grand Army it usurped really liked their acronyms (much like their real world counterparts). The most egeriogus examples being the assorted combat walkers, which all start with AT, an acronym for "All Terrain", which is supposedly one of the justifications for the legs in the first place.

AT-PT

One shot kill.

The oft forgotten (since it debuted in Dark Force Rising instead of the movies and didn't have a clear description till the Dark Force Rising Sourcebook) little cousin to the AT-ST. For the most part the role it once had in the story has been replaced with the AT-RT, since that fits the role of "small pre-Imperial walker" but actually appeared in the movies. The modern (3E onward) Sentinel looks like one with less armor.

AT-DP

All-Terrain-Defense-Pod. An early design for the AT-ST that was reused by Disney. No clear reason for it to exist was ever given besides Disney wanting to have a different looking AT-ST. Possibly to have a light walker that was more intimidating than the AT-RT, but not have letting AT-ST lose it's rep to being slapped around without too much effort.

In Rebels (it's only appearance so far) it's less than ideal, unable to gain even a temporary victory because they're the bad guys in a Disney cartoon, who aren't Thrawn.

AT-ST

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Greetings Citizen have you discussed your new Imperial taxes with your local representative yet?

"All Terrain-Scout Transport", aka "The Chicken Walker", aka "the thing that the Imperial Guard Sentinel is a shameless rip-off for". Basically a box-shaped control room built around a central heavy laser gun and mounted on two spindly legs.

AT-ST on the Table-Top

In RPGS

AT-STs are a quintessential part of a Star Wars campaign. They are an excellent choice for and GM who would like to avoid the big bad getting blasted apart by your PCs hotshot Corellian gunslinger or the Mandalorian you somehow allowed in the game, without just having all the boss fights be in space. Big and scary without being completely out of the scale a party can reasonably deal with, though if you party lacks a Jedi or heavy weapons they might need to get creative, which the source material provides many examples of.

D20 Star Wars Minis

In addition to looking Derp as all get out the AT-ST was something of a middling unit, It was very tough and had DR10 but despite hitting hard it struggled to actually land those hits combined with how confined maps in usually were ad you had a unit that could struggle to kill it's points back, but did an excellent job tanking for the rest of your army.

In Legion

Content.

AT-AP

Artillery.

AT-TE

Spider Tank.

AT-AT

"All Terrain-Armored Transport". These are the big, BIG bastards amongst the All-Terrain Walkers; enormous quadrupedal armored transports who look almost like giant robot cows, but who aren't so funny when you realize they can shrug off heavy artillery like it was nothing. Slow as molasses, but they will get to where they're going, and the head-like cockpit's twin heavy lasers can dish out a fair bit of pain along the way. Slow is something of a misnomer whilst the the movements are far from swift long legs can cover alot of ground, allowing the walker to make nearly 40mph (or 66kph). Not quite speedy but more than enough to cover a lot of ground to deposit it's complement of troops without taking too much fire.

AT-ACT

The armored Space Truck of Empire, possibly made from the repurposed hulls of the old model AT-AT seen in Rebels. They haul important things from one place to the next.

Sure go ahead and laugh. I will still eat your Infantry.

AT-AT On IS the tabletop

Told you that you could play an entire game on it's base.

AT-M6

The First Order's Bigger Scarier Gorilla walker.

Gallery

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  Size Comparison
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  After the Empire fell apart a ton of their stuff was left just lying around...

First Order Variant Gallery

The First Order had a bunch of Fanboy variants of the walker's built.