I'm not sure how the military work when it comes to currency requirements. For private and commercial pilots it's certainly the case that they sometimes have to conduct flights (or at least, conduct specific procedures) purely for the sake of maintaining currency. I would be surprised if the same concept didn't apply broadly.

It's not quite as strong as because you flew that mission we are cancelling that training session, more because you flew that mission you don't need be booked out on a training session.