First introduced by the Republic during the Clone War, the All Terrain Reconnaissance Transport, or AT-RT, has since been co-opted by the Rebel Alliance to aid their war against the Empire.
In the Star Wars Legion starter box as well as the fourteen Rebel models there is also a Rebel AT-RT.
The model comes with optional weapons and was easily constructed. I added Citadel Sand to the base.
I then gave the model a white undercoat using Corax White spray.