Ninja'd
Hatting is correct.
It works just the same on Vader with Brutality. You can't play Single Purpose on Vader to attack 2 targets twice (4 targets).
You are probably right, but would you mind explaining why this is so?
Why does this command card not trump the standard rule if it includes an attack in the special action?
Absolutely. This is the rule taken directly from pg 6 of the RRG under "Special Situations Regarding Attacks":
"Unlike heroes, a figure that has a Deployment card can use only one of its actions to attack per activation. This includes using special actions that involve performing one or more attacks (such as the Nexu’s “Pounce” or Darth Vader’s “Brutality”)."
So, when using "Single Purpose", you are not able to play Leia's "Battlefield Leadership" special ability twice, because you cannot attack with Leia twice. If the ability specifically stated that you can attack more than once (like "Assault") only then you can break the one attack per activation rule.
Ok great, thank you!
Now would you mind explaining to me why this rule doesn't apply:
RRG page 2:
Golden rules
Card abilities can override the rules listed in this guide.
Why is this command card not overriding the rule you quoted on page 6?
This rule does not apply because the card ability is not overriding the one attack per activation rule at all.
Assault, however, does:
"Assault - You may perform multiple attacks."
Since Leia's ability does not override the one attack per activation rule, she is forced to follow the one attack per activation rule. If Leia had Assault, she could most definitely use her ability twice. But she does not.
I see... So the card, even though it gives the ability to perform a special action twice, it doesn't give an override to all the items within that special activation. Is that the argument?
Pretty much. It's the same exact rule why you can't first take an attack action, and then use a special ability that allows you to attack. Just because the special action says to make an attack, you already made your one attack in your first action, so you are unable to use that special ability to attack again.