Adaptive Strategy question

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**KingGarland**

WHEN: Your Command phase.
TARGET: One Adeptus Astartes unit from
your army.
EFFECT: Select the Devastator Doctrine,
Tactical Doctrine or Assault Doctrine. Until
the start of your next Command phase,
that Combat Doctrine is active for that unit
instead of any other Combat Doctrine that
is active for your army, even if you have
already selected that doctrine this battle.

My question is, can I use this stratagem if I do not active combat doctrines in the command phase before using this strat

**alextroy**

I can't see why you couldn't.

**KingGarland**

it is because of this line

...that Combat Doctrine is active for that unit
instead of any other Combat Doctrine that
is active for your army..

specifically the word instead, implying that another Combat Doctrine has to be active.

**alextroy**

They could have said "might be" instead of "is" to be clearer that no Doctrine need be active for the rest of the army, but it is not required. Otherwise the rule would state that a Doctrine must be active to utilize the Stratagem, which it does not.