Imperial Army presence in Onoan

The Imperial Army has deployed support units to assist the Stormtrooper Corps in areas the Corps is deficient in; namely armor and air power, though chances are about even that they are assisting with occupation efforts as well with infantry units.

Imperial Army Armoured Corps
During the initial occupation of Florrum, upwards of five AT-IC walkers were deployed to deal with smaller space-bound assets that larger cannons may have missed, and disabled a number of civilian vessels to disasterous effect in their AO, likely killing dozens by disabling their vessels.

Additionally, a TX series Occupier was deployed to the area near the Old Spaceport to support Stormtrooper units in riot suppression after WHITE LANCER  made their presence known in the AO.

Considering the deployment of specialist assets, it is almost certain the Imperial army is being relied on by the occupation force to deploy and manage these vehicles and more, ranging from most standard All Terrain vehicles to TX series tanks.