I've seen a lot of people call the deaths in this series pointless: THEY ARE NOT POINTLESS.
Especially in this last book. Not every death is a big eventthing. Some deaths are, some are just quiet, some are just mistakes. And some are crimes. War is the worst crime the world has ever seen, and in wars, people die. There is no such thing as main characters or immunity. People die, and there is no meaning, other than the fact that they were in a war, and they died.
That is what war does. It kills people. It kills the ones you love and the ones you least expect to lose. That's one of the great message of this book. No one can escape war.