Previously thought 75th Ranger were only tier 2. But know I’ve discovered they have a tier 1 unit (RRC). How does one get into the RRC.

Not sure why but I’ve briefly heard of RRC within the regiment. I’ll be doing some more research on them. But the reason for the comment is just to know more about them. Perhaps some important operations they’ve done etc. and what the RRC specializes in. (guessing reconnaissance on a superior level) and probably most of what tier 1 units specialize in.