In a series of comments under What "whizzy new tools" in space are America and its allies using to track China’s military activity and illegal fishing? (The Economist) (closed as off topic and I don't disagree) I wrote
There are two SE sites that we don't have yet but I think would thrive - Optics & Photonics (those questions get spotty answers at best in Physics SE) and War & Military Technology SE.
and later
Since there is so much information available on modern (and older) military equipment and its capabilities, and who's buying what, as well as the outcomes of military conflicts, I think there's certainly a large, rich fact base out there from which a Warfare & Military Technology SE site could draw questions and answers. Right now Politics, History, and a tiny corner of Space SE is where war can get a foothold in Stack Exchange, and since has such a huge footprint and impact on the real world, it could easily keep its own site active.
I'm wondering how accurate my impression is that "Politics, History, and a tiny corner of Space SE is where war can get a foothold in Stack Exchange". Perhaps there's more I don't know about, so I'd like to ask:
Question: What are the current sites that questions about warfare & military technology are on-topic and asked & answered with some regularity?
I don't mean any question would be on-topic, but some of them at least can be.
One way to start would be to check sites (via SEDE) that have tags that contain fragments like [*military*] and [*war*] that have regular activity. Another might be personal experience.