Ground Forces is an expansion for the PC version of military World War II MMO game War Thunder. Currently, players can access Soviet and German vehicles in Ground Forces with other nations rolling out later. There are dozens of light, medium and heavy tanks, as well as self-propelled artillery and anti-air guns. The latter will become useful in Combined Arms battles, available in Realistic and Simulation game modes where player-controlled ground vehicles are fighting alongside player-controlled planes (and AI-allies in some cases). Combined Arms will be enabled later once enough players reach high levels with their ground forces, but anyone can try this mode in Custom Battles already.