RIP David Drake. He was an incredible writer, a Vietnam war veteran who wrote military fiction that, in his words, "indicated very graphically that war was a messy and utterly futile business."
He was a generous mentor to aspiring SF authors and a true mensch.
Here's a fascinating essay he wrote back in 2012 about war and SF: https://www.tor.com/2012/01/20/a-kind-of-humor/