Syndicate Mission Ranks?

[BetaNoire]

What do the ranks in (Parenthesis), like (General) mean? General is a rank I haven't attained yet.

 

[Yagutzal]

I think those ranks in parenthesis just give general idea of mission difficulty, and how much standing it gives. Higher rank=more standing, like in your screenshot, esteemed from red veil is highest rank from this set and gives highest reputation for this set. I don't know if there's anything else to it. You should be able to do higher rank syndicate missions just fine.