Imperial-class repulsortank
The Imperial-class, or Imperial-series repulsortank, was a line of military vehicles made by Ubrikkian Industries. Three versions of the tank were created; light, medium, and heavy variants. The designation applied to the amount of armament carried by each variant tank as all three tanks of the Imperial-class shared the same chassis design. The heavy variant of the Imperial repulsortank was the standard production model.
Imperial-class repulsortank variants

Light Imperial Repulsortank
The cheapest version of the Imperial-class repulsortank, the 1-L lacked the main gun found on the heavier variants. It required a crew of only two to operate—driver and gunner—and had space for either the sergeant or platoon sergeant major. It mounted a single Merr-Sonn Munitions, Inc. Mark 3/S Medium Blaster Cannon.

Medium Imperial Repulsortank
The medium Imperial repulsortank was produced in limited numbers and intended for use by platoon officers to command their units in the field. It required a crew of three to operate—driver, gunner, and commanding lieutenant—with enough space for the sergeant major and communications equipment as well. The 1-M mounted a Merr-Sonn Mark 3/S Medium Blaster Cannon and a heavy repeating blaster.

Heavy Imperial Repulsortank
The heavy Imperial repulsortank was the most widely produced of the Imperial-class and required a crew of four to operate—driver, two gunners, and the commanding sergeant. Considered to be a squad level unit in itself for the purposes of the Order of Battle, the 1-H mounted a Merr-Sonn Mark 4e/S Heavy Laser Cannon and a Mark 3/S Medium Blaster Cannon. Of the first 1,500 tanks produced, 1,420 were assigned to the first Death Star, and eighty to the Imperial Hammers Elite Armor Unit.
Appearances
Sources
"Repulsortank Battlefield" – Star Wars Adventure Journal 9
"Special Military Unit Intelligence Update" – Star Wars Adventure Journal 15
"The Draw" – Star Wars Adventure Journal 15 ("Vernet Imperial Army Training Camp" capsule)
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