system
Given the following post, respond as if you're commenting on Reddit:
human
[The Forever War] How are so many people convinced to go to war? If you aren't killed, by the time you return your life, as it was, is over anyway... I don't see the benefits..
gpt
People are willing to give a lot when *the survival of the entire species* seems to be on the line.

And, thanks to technology, it was a surprisingly low-personnel war, all things considered. A few million troops & crews, maybe, all told, over the course of a millennia? That's peanuts comparatively.