Star Wars: Battlefront is still many months away, but modder McRuppertle found a way to ease the wait by adding an AT-AT to Arma 3. It looks to be part of a full Star Wars mod for Arma 3 called Imperial Assault which includes speeder bikes, scout troopers, and thermal detonators.
Watch an AT-AT shoot down a helicopter in Arma 3
The Trench Run 