More like The Last Ditch

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Forever WarSeries
series10 books1972
Set in space.
Start with Hero →
Known SpaceUniverse
universe142 books1964
About aliens, set in space.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Man-Kzin Wars, Ringworld, Fleet of Worlds
Starship TroopersNovel
Robert A. Heinleinstandalone novel1959
About coming of age and aliens, set in space.
Old Man's WarSeries
series16 books2005
Space opera, set in space.
“Sign a document at 65, saying you intend to join up 10 years later.”
from the catalogue
Start with Old Man's War →
Ender's GameUniverse
universe39 books1977
Science fiction, set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes Ender's Shadow, Ender Wiggin, First Formic War, Second Formic War, Fleet School
HaloUniverse
universe70 books2001
Set in space.
“The shelf grows out of a 2001 video game, but it reads as its own body of military science fiction, built by many hands.”
from the catalogue
Start with The Fall of Reach →
includes Halo