Well I'm terribly sorry, but that's how it is. Confirmed by Westwood, TD is from Soviet Victory, RA2 is (obviously) from the Allied victory.
NOD started as a single small terrorist group that acted in the third-world countries in the middle 20st centuary. When kane revealed himself for the first time to the media as the self-porclaimed leader of the group, more and more unannomus Terrorist groups joined the Brotherhood (mostly Arabs) as he used he's charisma abilities. That's stickin to text from the TS menual book. Its also confirmed by westwood.