Not further more than 'Electronic Arts' and 'Digital Illisions CE', and I haven't looked further into where those companies sprang from.
Forgive me, I go to bed without telling
That sounds like a reasonably effective way at training soldiers. Hearing the circumstances on real-life battleilds make it out to be a total nightmare. While someone's giving an artillery barrage, there's someone receiving that artillery barrage. There's no assurance of life at any second; and there are gruesome deaths present as much as swift ones.
A man sees the warfare with his eyes, senses what could happen to his body through them and nopes out. I think video game training is less about inclining to kill, and more about preparing for what's about to be faced. Suprise grenades, landmines, and geurilla ambushes. We had to read 'The things they carried' in high school, a vivid description of the horrors draftees faced in veitnam.
I feel civilian war video games don't hold much of a candle to that experince, in fact it's a little romanticised because of all the points and means to respawn, and all the other magical video game logic. Less adrenneline and fearing for your life, more frustration that you're not winning.
The way I see my idea is: The battlefeilds in the game are real vast open places you can physically visit in real life. When random players across the world are running the game on their computers, and they queue up for a match, There are projectors in those places which direcly project everything that's happening in the game onto those real-life places. Anyone in those places can harmlessly observe how the battle is going in that arena as if they were in the middle of it, but the random players playing around the world don't see the spectators, they just see their game.
AI must be monitoring because I have been spammed by World of Tanks games since we were last here.