For Overt Operation, do you need to spend at least one buff to trigger the effect that buffs all friendly units?

Ruling: You do not have to spend any buffs to buff all friendly units. The first sentence uses "may" so you can choose to spend zero buffs, and the second sentence (which buffs all friendly units) is not conditional on the first.

Sequence:

• You may choose to spend zero buffs from the first sentence
• The second sentence effect (buffing all friendly units) still applies regardless