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The brotherhood banner allows for the auto-pass of the Force Weapon psychic test, and Paladins and GKT troops can take them. Can only one unit have it, or can I put one in every unit that can take it?

Also, does it count as a power weapon, force weapon or close combat weapon?

Since it doesn't say that there's a limit, there isn't.

It's not a special CCW and not a normal CCW, it's just wargear. You're still allowed to attack in close combat, but you don't get to ignore saves or ID people.

Ok, well do normal Space Marines get options for multiples of the same banners? I don't want to be a jerk or anything...and since it's the 'brotherhoods' (chapter) banner, it's not likely that multiple brotherhoods fighting as one army.

Youre not being a jerk. EVERY unit that has the banner as an option can have one

See Wolf Standard

It also is NOT a chapter banner, that is an error of assumption on your part.