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On a completely different topic, I pondered how one could cross XCOM and MCU with minimal timeline/canon changes. The reason for this is that I figure the planet needs to cover three areas of planetary defense - mundane threats (terrorist/criminal groups), not-mundane threats (supernatural), and extraterrestrial - and have organizations that focus on each area specifically. First problem that popped up came from MCU, since as we see from Thor/Avengers/Thor 2 that they consider themselves to be handling extraterrestrial defense. I doubt Fury would allow XCOM to form as a separate organization under UN authority.
For those wondering about the supernatural side of things, take my Nanoha/XCOM idea from long ago, and spin off Nanoha and co once they're experienced enough members of XCOM. I want to call them SWORD for some reason.
Now, imagine Avengers + Nanoha + Wolkenritter + XCOM forces on a joint mission. :3