The End of All Things #3: Can Long Endure: The End of All Things

They signed up to defend humans from hostile aliens, but this group of Colonial Union soldiers finds themselves, instead, repeatedly sent to squelch rebellious human colonies that want to leave the CU. It's not a sustainable situation. Something has to give. Part Three of the four parts of The End of All Things, John Scalzi's conclusion to the Old Man's War tale that began with The Human Division.