I think you inadvertently found the bunker where the AI Rasputin is housed.
Why this conclusion, you ask? Two reasons:
First - It's not a huge stretch of the imagination that "RAS" might be referring to Rasputin to begin with.
Second - according to a Ukrainian colleague of mine, the names "Putin" and "Rasputin" are sometimes used in a word-play joke, which (very) loosely translates to:
1-putin
2-putin!
Which leads me to believe "RAS-2" may be a nod to this word-play joke.
Granted, Occam's razor suggests that the first reason is the most likely, however, given the importance of Old Russia so far, I wouldn't put it past Bungie to put in some subtle cultural references.
English
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I think your 100% correct because on Mars in the Clovis Bray skyscraper (development of planetary defense and AI), there are doors that have the same style of writing as those in the RAS. 2 vault and guess who controls the AI in the skyscraper Rasputin,
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But in the story aren't you going to the moon to look for Rasputin at the end of the Beta? Like the next mission is most definitely on the moon I recall, and I at least thought at the end of the last one your ghost was telling you that you needed to go find it. I could be wrong and probably am.
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Couldn't be that there is also a RAS-1 bunker elsewhere?? I mean you know, bunker #1, bunker #2 etc. Most govt/military bases would probably use a basic numbering system....Idk