Apart from war machines communicating through HTTP, I can't help but giggle to the thought of such a dialog:

- I repeat, the enemy seems to be not responsive. - What, you already killed them? - No we came with a bigger force but their layout didn't change. I don't think they're war-scale.

Joking aside, there's nothing making HTTPS inherently less secure than any other secure channel out there, right?

(disclaimer: I'm a web developer)