The Fantasy Review’s list of 8 Military Science Fiction Book Series with Intense Action and Warfare.
Confederation by Tanya Huff
From the blurb of book 1:
Staff Sergeant Torin Kerr was a battle-hardened professional. So when she and her platoon were yanked from a well-deserved leave for what was supposed to be “easy” duty as the honor guard for a diplomatic mission to the non-Confederation world of the Silsviss, she was ready for anything. Sure, there’d been rumors of the Others—the sworn enemies of the Confederation—being spotted in this sector of space. But there were always rumors.…
Vatta’s War by Elizabeth Moon
From the blurb of book 1:
Kylara Vatta is the only daughter in a family full of sons, and her father’s only child to buck tradition by choosing a military career instead of joining the family business. For Ky, it’s no contest: Even running the prestigious Vatta Transport Ltd. shipping concern can’t hold a candle to shipping out as an officer aboard an interstellar cruiser. It’s adventure, not commerce, that stirs her soul. And despite her family’s misgivings, there can be no doubt that a Vatta in the service will prove a valuable asset.…
The Lost Fleet by Jack Campbell
From the blurb of book 1:
The Alliance has been fighting the Syndics for a century—and losing badly. Now its fleet is crippled and stranded in enemy territory. Their only hope is a man who’s emerged from a century-long hibernation to find he has been heroically idealized beyond belief….
Captain John “Black Jack” Geary’s exploits are known to every schoolchild. Revered for his heroic “last stand” in the early days of the war, he was presumed dead. But a century later, Geary miraculously returns and reluctantly takes command of the Alliance Fleet as it faces annihilation by the Syndics….
The Forever War by Joe Haldeman
From the blurb of book 1:
The Earth’s leaders have drawn a line in the interstellar sand–despite the fact that the fierce alien enemy they would oppose is inscrutable, unconquerable, and very far away. A reluctant conscript drafted into an elite Military unit, Private William Mandella has been propelled through space and time to fight in the distant thousand-year conflict; to perform his duties and do whatever it takes to survive the ordeal and return home.…
Old Man’s War by John Scalzi
From the blurb of book 1:
John Perry did two things on his 75th birthday. First he visited his wife’s grave. Then he joined the army.
The good news is that humanity finally made it into interstellar space. The bad news is that planets fit to live on are scarce―and alien races willing to fight us for them are common. So: we fight. To defend Earth, and to stake our own claim to planetary real estate. Far from Earth, the war has been going on for decades: brutal, bloody, unyielding….
Honor Harrington by David Weber
From the blurb of book 1:
Having made him look a fool, she’s been exiled to Basilisk Station in disgrace and set up for ruin by a superior who hates her.
Her demoralized crew blames her for their ship’s humiliating posting to an out-of-the-way picket station.
The aborigines of the system’s only habitable planet are smoking homicide-inducing hallucinogens.
Ender’s Saga by Orson Scott Card
From the blurb of book 1:
In order to develop a secure defense against a hostile alien race’s next attack, government agencies breed child geniuses and train them as soldiers. A brilliant young boy, Andrew “Ender” Wiggin lives with his kind but distant parents, his sadistic brother Peter, and the person he loves more than anyone else, his sister Valentine. Peter and Valentine were candidates for the soldier-training program but didn’t make the cut―young Ender is the Wiggin drafted to the orbiting Battle School for rigorous military training.…
Frontlines by Marko Kloos
From the blurb of book 1:
The year is 2108, and the North American Commonwealth is bursting at the seams. For welfare rats like Andrew Grayson, there are only two ways out of the crime-ridden and filthy welfare tenements: You can hope to win the lottery and draw a ticket on a colony ship settling off-world . . . or you can join the service.
With the colony lottery a pipe dream, Andrew chooses to enlist in the armed forces for a shot at real food, a retirement bonus, and maybe a ticket off Earth. But as he starts a career of supposed privilege, he soon learns that the good food and decent health care come at a steep price . . . and that the settled galaxy holds far greater dangers than military bureaucrats or the gangs that rule the slums….