More like Weapons Free

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JanissariesSeries
series4 books1979
Adventurous in tone, about political intrigue and slavery.
“Janissaries are an American series of military and political-based science fiction novels are set in an interstellar confederation of races, in which humans are a slave race entrusted with military affairs and law enforcement.”
from the catalogue
Start with Janissaries →
HonorverseUniverse
universe83 books1993
Space opera.
“At the center stands one officer, Honor Harrington — captain, then something far larger — and the six-limbed empathic treecat who rides her shoulder.”
from the catalogue
Start with On Basilisk Station →
includes Honor Harrington, Expanded Honorverse, Saganami Island, Worlds of Honor anthologies, Wages of Sin, Manticore Ascendant, Honor Harrington Universe short fiction, Star Kingdom (Honor Harrington)
Known SpaceUniverse
universe142 books1964
About aliens.
“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
VattaUniverse
universe10 books2003
Space opera, adventurous in tone.
“Get kicked out of the Academy and the family still hands you a ship.”
from the catalogue
Start with Trading in Danger →
includes Vatta's War, Vatta's Peace
ArmorNovel
John Steakleystandalone novel1984
Dark in tone, about aliens and madness.
Starship TroopersNovel
Robert A. Heinleinstandalone novel1959
Adventurous in tone, about coming of age and aliens.