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Codex Tactical Objectives says:

If your army is led by a <FACTION KEYWORD> Warlord, these Tactical Objectives replace the Capture and Control Tactical Objectives in the Warhammer 40,000 rulebook.

How does this interact with abilities that allow you to change your Warlord such as 'Shoulder the Mantle'? Do you use the Tactical Objectives of your original Warlord's faction or do you switch Objectives as you switch Warlords?

RAW... Weirdly it looks like you're supposed to change!

There's no clause about it only being your Warlord at the beginning of the game. It just says if you are led by that Warlord then use them.

I feel this is not the intention of the rule though. For instance, no one plays that when your Warlord dies you stop using the faction objectives, which is another implication of the wording of the rule. You aren't led by a dead warlord after all!

Also, in practice if you use cards this is an absolute nightmare! So I think it's unlikely any event will play it this way. Contact the TO if you're playing a tournament.

We had this discussion before. In short we have no idea because GW didn't write the rules properly.