The battle bunker requires only a Soviet construction yard deployed to be produced, and does not require power to function. This simple fortification functions in the exact same way as a standard civilian garrisonable structure, but it can also be repaired by conventional means other than using engineers. Yuri Prime can not capture this structure. Despite it can only hold 5 infantry units, the battle bunker is a useful and cost efficient garrisonable structure in a pinch, being more powerful than 2 Sentry guns when it is fully garrisoned of conscripts for the same cost and without any power requirements while also removing much of the vulnerability infantry would have outside a building, especially against radiation.
This gives conscripts greater utility and much more powerful defensive capability on the cheap although other player controlled GIs or Initiates or a combination of all three can also occupy battle bunkers.