Hello r/Military, I searched dozens of book lists for Space Marine/Super Soldier/Military Science Fiction novels into one large megalist and then found the top military science fiction books focused on the soldier. I excluded lists specifically about space naval warfare or space opera which often have fleet battles and only included lists trying to focus on the individual or squad.
Ranks 1-10
Title Author Lists
1. Old Man's War John Scalzi 26
2. Starship Troopers Robert Heinlein 25
3. The Forever War Joe Haldeman 25
4. On Basilisk Station David Weber 16
5. Terms of Enlistment Marko Kloos 16
6. Ender's Game Orson Scott Card 15
7. Dauntless Jack Campbell 14
8. Armor John Steakley 13
9. Valor's Choice Tanya Huff 9
10. All You Need Is Kill Hiroshi Sakurazaka 8
I've read 6 out of those 10. I was surprised to see Old Man's War eek out the perennial favorite, Starship Troopers, but Scalzi has written 7 books in that series so maybe it makes sense.
Ranks 11-20 (2 more w/ ties)
Title Author Lists
11. A Hymn Before Battle John Ringo 8
12. Hammer's Slammers David Drake 7
13. Trading in Danger Elizabeth Moon 7
14. Dune Frank Herbert 6
15. Dorsai! Gordon R. Dickson 5
16. March Upcountry David Weber & John Ringo 5
17. Gaunt's Ghosts Dan Abnett 4
18. In Fury Born David Weber 4
19. Ninefox Gambit Yoon Ha Lee 4
20. Red Rising Pierce Brown 4
21. The War of the Worlds H. G. Wells 4
22. The Warrior's Apprentice Lois McMaster Bujold 4
I'm 1/10 of that set!
And Top Authors with books and list count:
Authors Books Lists
John Scalzi 3 26
Robert A. Heinlein 3 26
Joe Haldeman 3 25
David Weber 15 18
Jack Campbell 12 17
Marko Kloos 2 17
Orson Scott Card 1 15
John Steakley 1 13
Tanya Huff 7 11
Elizabeth Moon 7 10
How many have you read, and are there any more recommendations? I've never read Terms of Enlistment but based on this analysis, I'd need to. More detailed analysis is here in this article including a link to my upcoming military sci-fi.