A 'Troika' is simply a turret. On Gears of War 1, you could find Troikas on certain multiplayer maps, though this is not the case on Gears of War 2. Now, on Gears of War 3, Troikas can be deployed on the Horde mode. Once placed down, these can be upgraded. Until they are upgraded enough, Troikas must be controlled by the human player.
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