All the other Lemmy videogame communities disallow humorposting but the rules here don’t seem to mention it, so hopefully it’s ok

If you’re wondering how come they are so many people in one channel - they’re actually all in separate channels, in their “squad”'s channel. But you can also bind a “shout” keybind in Mumble settings so your voice is transmitted to linked channels. In this case in the video you can see the “Command 1” channel and people can shout it from the regular line member channels.