Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

Not really sure where else to put this, but can anyone provide a reference to where it says you can only take 1 leader rule (SM for example can trade the generic Combat tactics for something like Shrike's fleet rule). I am pretty sure that that rule exists, but I can't find where exactly it is stated.

The only restriction is on Unique models - only one allowed (per side).

You can bring two 'leaders' easily enough as 2 HQ options are part of the default Force Organization Chart.

Editing to add:
In the case of Space Marines, there is a restriction on using a single "leader's" army wide ability (Chapter Tactics, or whatnot) - but that is somewhat unique to Space Marines.

Right, but my question is asking if only 1 of the special "chapter tactics or equivalent" can be used if 2 models with that special rule are on the table.

For SM it's in the FAQ, if you have two leaders (i.e. shrike and Vulcan) you must choose which ability replaces combat tactics at the beginning of the game.

Thank you that was exactly what I was looking for!

You can only replace combat tactics once (for SM). Other armies would be similar, if they replace an army ability with another, and both leaders do that, you would have to choose.