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Gold is a special currency that is obtained through either buying it with real money, or getting a small amount of gold when you finish your first battle of the day. You earn 4 gold upon completing your first match each day. In-game gold can be used to buy just about everything.
Things you can buy with gold range from: Veteran membership, Soldiers, Soldier's uniform skins, Assault Teams, Vehicles, Vehicle Supply Crates, Weapons, Weapon Modifications, Weapon skins, WarBonds, Ribbon boosters.