More like Peacekeepers

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Old Man's WarSeries
series16 books2005
Military science fiction and space opera, set in far future.
“Sign a document at 65, saying you intend to join up 10 years later.”
from the catalogue
Start with Old Man's War →
CoDominiumUniverse
universe98 books1971
Military science fiction, set in far future.
“The body of work runs along a few hard threads rather than one line.”
from the catalogue
Start with The Mote in God's Eye →
includes Moties, Laurie Jo Hansen, Falkenberg's Legion, War World
Podkayne of MarsNovel
Robert A. Heinleinstandalone novel1963
Space opera, about coming of age, set in mars.
“Poddy has one goal in life, to be the first female starship captain.”
from the catalogue
2312Novel
Kim Stanley Robinsonstandalone novel2012
Hard science fiction, about genetic engineering and terraforming, set in far future.
Islands in the SkyNovel
Arthur C. Clarkestandalone novel1952
About space exploration, set in space station.
“Clarke wrote the story as a travelogue of human settlement of cislunar space in the last half of the twenty-first century.”
from the catalogue
The Moon Is a Harsh MistressNovel
Robert A. Heinleinstandalone novel1966
About artificial intelligence and rebellion and revolution, set in the moon and far future.