Iron Sky: Invasion

You will acquire the Banzai during the final Russian side mission. It is only playable during this mission. The soonest you can do this is immediately after destroying the 3 zeppelins in Chapter 4. On this final mission, you will be asked to protect the Mir fleet in battle. Once you have defended it in a pretty standard fire fight, you will need to give it back. The trophy unlocks as soon as you have control of the ship.