While Bethesda initially said they will consider both Fallout Tactics and Fallout: Brotherhood of Steel as non-canon, looks like they changed their mind and eventually decided to consider the story of Fallout Tactics more or less canon where it does not contradict previous Fallouts (the inconsistent parts are non-canon).
There is at least one reference to the Midwestern Brotherhood of Steel from Tactics. Scribe Rothchild says: "There's also a small detachment in Chicago, but they're off the radar. Gone rogue. Long story."
There is at least one reference to the Midwestern Brotherhood of Steel from Tactics. Scribe Rothchild says: "There's also a small detachment in Chicago, but they're off the radar. Gone rogue. Long story."