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IMO that's only if you know about the book. If I hadn't read the book I would consider it as a statement showing the seriousness of their training (i.e., "this isn't a game, we're training you for a war, so don't fool around and please take this seriously.)

Ironically, after seeing the trailer, that poster, and even the comment above with the spoiler alert, your comment right here is the thing that just made me think, "Ohhh, the kids in the movie are fighting a war WITHOUT EVEN REALIZING IT?"

So, you know, whatever, but yeah I think it's a spoiler.

Agreed. Just watched the latest trailer a couple of days ago and it was absolutely clear that the kids were fighting a real war. Quotes like "we have to tell them the truth" make that totally clear imo