@Crake, can I suggest you rephrase your OpSec subsections?
We don't want to hide things from people. We're keeping things a little quiet because the Others feed on fear and tales of their deeds, and spreading this tale will strengthen the ones who fled. We should make it clear that generalities can be mentioned (thousands of Thenn saw, we can't keep this secret), but that they shouldn't describe any events or creatures fought. They went North, they fought spirits in frozen barrows, they triumphed despite the foes' dark sorceries.
Honestly, I think that it's not necessary and that we can let this be known. It happened far beyond the Wall, after all, in a place known to be dangerous. And we won! And the Wyverns and Moonchaser were effective in fighting off powerful monsters!
IMO the men spreading details of this op is a good thing for us, and I dislike the fact that it's being hidden. This was a win, and we ought to market it as such instead of trying to hide it. People will wonder about the dead pilots and destroyed vehicles, so IMO we may as well honor them publicly and all that.
But if you do want to ask people to keep quiet, the start of this post is a suggestion of a better way to frame things.
EDIT : And you should tell this to Moonsong too, and not just the pilots and crews.