But their individual sacrifice is a silver lining common to many first world war movies: in the absence of a larger and nobler purpose, the best soldiers can do is fight for each other, and hope to spare a life or steal a little bit of dignity and humanity.
The fighting for each other bit. That’s always what soldiers do. That’s why armies are set up the way they are, in sections, platoons, companies. To engender that community which is what is being fought for.
Never been quite sure whether the Spartan hoplites all fighting alongside their gay partner was true or not but it’s the same idea. Very few indeed will risk their lives for King and Country but set it up right and many will for the band of brothers.