Iron Sky: Invasion

I encountered a game breaking glitch at this point. By the end of this battle I had not used the Canadian or Japanese fighters at all and found that even after all enemy vessels were destroyed and my only remaining objective was to "Return to the ISS to change ship", it was impossible to do so. I could not access either ship (though I could still use the Korean one), even though both can be clearly seen docked at their respective space stations. I restarted the chapter, and this didn't help either. Will simply have to keep going further back in chapter select or restart completely. Ultimate advice, make SURE you have access to the other ships as early as they are available, perhaps change ships periodically as you progress through the game. Good luck!