The heroes nobody remembers, in worlds that don't deserve them.
You've read the power fantasies. You've read the grimdark where nothing matters. You're looking for something between: stories that take broken worlds seriously but refuse to let the darkness win.
That's what Ben Wilson writes. Military science fiction and dark fantasy about forgotten people who endure systems designed to use them up and prove they deserve to be called heroes.
Start with Postal Marines: a future that's had two thousand years to improve and hasn't, and a marine the system would rather forget.
Nine years U.S. Army. 25+ years in technology leadership. He's seen the machinery from the inside.