Adventure Military Space Opera

The Colonial Defense Forces usually protect humanity from alien attack, but now the stability of the Colonial Union has been threatened, and Lieutenant Heather Lee and her squad are called to squash a rebellion on a colony world. It seems simple enough - but there's a second act to the rebellion that finds Lee captive, alone, and armed with only her brains to survive.

The Year is 2040. The Marines have landed on Mars to guard the unearthed secrets of an ancient and dangerous alien race: Ourselves. Scientists have discovered something astonishing in the subterranean ruins of a sprawling Martian city: startling evidence of an alternative history that threatens to split humanity into opposing factions and plunge the Earth into chaos and war.

2040: Ruins of ancient civilization uncovered on Mars reveal startling truths about the creation of humankind. 2042: In the gray dust of the Earth's Moon, an extinct enslaving race left behind more answers, more questions...and a grim warning. 2067: As Earth's warring factions clash in space for scraps of alien technology, a strange artifact lies trapped beneath the ice-locked oceans of Europa: a machine that holds the key to the final human destiny. It is called "The Singer" for the eerie tone it emits.

Throughout the Fourteen Worlds of humanity, no race is as feared and respected as the Dorsai. The ultimate warriors, they are known for their deadly rages, unbreakable honor, and fierce independence. No man rules the Dorsai, but their mastery of the art of war has made them the most valuable mercenaries in the known universe. Donal Graeme is Dorsai, taller and harder than any ordinary man. But he is different as well, with talents that maze even his fellow Dorsai. And once he ventures out into the stars, the future will never be the same....

A small band of pilots fight against a seemingly unstoppable alien empire in this thrilling space opera. Commander Lanoe's skills made him a hero of the interplanetary civil war, but he was left with nothing except battle scars and painful memories. But now he faces the greatest threat mankind...

Devi Morris has a lot of problems, and not the fun, easy-to-shoot kind either. After a mysterious attack left her short several memories and one partner, she'd determined to keep her head down, do her job, and get on with her life. But even though Devi's not actually looking for it this time, trouble keeps finding her. She sees ghostly creatures no one else can, the inexplicable black stain on her hands keeps getting bigger, and she can't seem to stop getting into compromising situations with a man she's supposed to hate.

The 200 years' (and counting) peace was a time of tranquility that hasn't been seen since...well, ever. Mankind in the Galactic Age had finally conquered war, so what was left for the military to do but drink and barbecue? That's the kind of military that Sergeant R. Wilson Rogers lived in before he left the fleet to become a smuggler. But it turns out that smuggling is hard. Like getting-arrested-for-dealing-with-pirates-and-forced-back-into-service kind of hard.

Henry Wong and Sylvia Todorovich have gathered the interstellar powers of the Ra Sector into a tentative alliance—an alliance that is tested by the return of the Sector’s former rulers: the Kenmiri Remnant. The Sector’s only hope of withstanding a genocidal faction of the Kenmiri is the Twelfth Fleet of the United Planets Alliance. But when Wong’s scouting flotilla collides with the Kenmiri, he discovers they now have a weapon that could easily destroy Twelfth Fleet.

When Adam Cain's old bounty-hunting friends, Summer, Monty, and Tidus, show up searching for the most-wanted fugitive in the galaxy, their efforts are thwarted by another old friend, Copernicus Smith. The deep-cover spy has his own reason for finding the fugitive, and it's not to earn the million-credit bounty offered for his capture. The elusive alien absconded with billions of credits from his homeworld just before the Mad Aris Kracion irradiated the planet. And now it seems as though the entire galaxy is looking for him.

As a lifer in the Imperial Navy, fighting in a war that has lasted generations, Lieutenant York Ballin's only hope for an honorable discharge is the grave. Neither the Empire nor the Directorate seems to care that millions have died or that millions more are doomed as hostilities continue. Ballin's only option is to hunker down, keep his crewmen and women in top condition, and try not to get them all killed.

An original novella in the "fast-paced, exciting military SF series" featuring Kris Longknife. Kris Longknife is back home from her galactic adventures, but her entire Fleet of Discovery has been annihilated. Now, humanity finds itself at war with an alien race more monstrous than anyone could have possibly imagined. General Terrance "Trouble" Tordon, Kris’s great-grandfather, is given the task of calming the panicked politicians, some of whom blame Kris for the disaster and would like to eliminate the ever-bothersome Commander Longknife.

Major Jimjoy Earle Wright, secret agent of the Empire, is intelligent and highly trained. But he succeeds all too well in overthrowing a military dictatorship - and the result is a new government inimical to the Empire and disgrace for Jimjoy. After surviving two assassination attempts, Jimjoy realizes that it's his own imperial superiors who want him dead; that, in fact, his worst enemies could become his best friends. He fights his way to safety on the planet Accord, where the Ecolitan Institute wins his loyalty and changes his identity.

With the galaxy-traveling aliens defeated, Nadya feels it's time that a new leader be appointed to guide the Riss into the future. At last, they have the freedom to explore the stars with their own navy and their own home planet of Freeland. In the process of defeating the aliens, a friendly alliance between the Sadr Alliance of Stars (SAS), the United Free Nations (UFN), and the Riss nation developed.

Logan Conner is the son of a king, the heir to the largest of the five star-dominions, and the best mech pilot in the galaxy. His people are plagued by pirates and raiders, surrounded by enemies, and not even his father can fight them all. Logan gives up his position, his rank, even his name, and becomes Jonathan Slaughter, leader of a rough-and-ready band of mercenary mech-jocks bent on taking the battle to the enemy on their own terms.

When United Planets Alliance Captain Henry Wong and Ambassador Sylvia Todorovich attempted to bring peace to the Ra Sector, they turned to the Drifters for neutral ground. Instead, the nomadic spacers betrayed the summit and attempted to kill everyone there. With peace forged despite the Drifters’ betrayal, Henry and Sylvia take an elite squadron in pursuit of the Drifter Convoy. Their enemies have friends at every turn, neutral worlds who will give them shelter - and if the UPA breaches that neutrality, everything Henry and Sylvia have worked for could crash down in flames.

When the UN invaded the Freehold of Grainne, the intent was simple: Force a noncompliant star nation back into the collective. What the politicians hadn't accounted for was that the Freehold had spent 200 years as the haven for every independent, rebellious, self-reliant adventurer in human space. Its military are scattered remnants, its bases smoking ruins, its cities occupied. But Grainne and its space habitats have resources beyond measure.

In the far future among the colonized worlds of the galaxy, there's a war going on between the majority of civilized worlds and a colonial theocracy. Trystin Desoll grows up fighting against religious fanatics and becomes a hero, a first-class pilot, then, amazingly, a spy. What do you do if you're a relatively humane soldier fighting millions of suicidal volunteers on the other side who know that they are utterly right, and you are utterly wrong, with no middle ground? Trystin Desoll has an idea.

Three decades ago, a colossal Empire unleashed its wrath upon a single world—Earth. Their intent was complete annihilation. However, when the dust cleared, the people of Earth were instead scattered to the stars, their home now a frozen waste at the center of a fortress system that none dared approach. Now, Earth's survivors are spread far and wide. Most lost to the stars, but some remained close to their enemy, waiting for a chance to finish the war on their own terms. For the Empire, the sins of the past are converging. The seeds are sown... and Harvest is coming.

In this finale of the Freedom's Fire series, the Free Army tries to salvage victory from what looks like a total loss. They've found a weakness in the Gray-Trog alliance they think they can exploit. But they'll need to ally themselves with the hated MSS and put their trust in people they've sworn to overthrow.

CDF Lieutenant Harry Wilson has been loaned out to a CDF platoon tasked with secretly removing an unauthorized colony of humans on an alien world. Colonial Ambassador Abumwe has been ordered to participate in final negotiations with an alien race the Union hopes to make allies. Wilson and Abumwe’s missions are fated to cross - and in doing so, place both missions at risk of failure.

We Only Need the Heads is a tale from John Scalzi's The Human Division.