OK - So far I'm on the quest "For the Republic" part 2. I have to 'take care' of the Brotherhood of Steel. Problem is, I've already completed the "still in the dark" quest for the Yes Man and placed Hardin as the Elder, i've killed the Van Graffs and i'm a member of the brotherhood. So far I haven't found a way to initiate cooperation between the brotherhood and NCR even though i'm friendly with both factions. Apparently this dosn't count as 'taking care' of the brotherhood. There must be a way to make the brotherhood fight for the NCR at this point, or do I just have to kill the BOS anyway? Any thought appreciated.