What are your thoughts on mechs? I've not written any as their place is taken by the robot Combat Units.

Anyway, here are the books you want...
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The Red Battlenauts show no mercy. Roaring out of the darkness of deep space, these ultra-high tech war machines pound the hell out of both sides in a bloody interstellar civil war. No one can even SEE the Reds--no one except Marine Corporal Solomon Scott. Recruited by the hardcore SEAL-like Diamondbacks, Scott becomes a secret weapon in the ultimate struggle for survival. In battle after battle on perilous alien worlds, Scott and the Diamondbacks fight back against the ruthless Reds, desperately holding the line in furious clashes of muscle and metal. But when a face from the past exposes the secrets behind the carnage, a quest for answers becomes a race against time. Because the masters of the Red Battlenauts have more on their minds than a thirst for conquest...and only Solomon Scott can hope to stand against them. In the galaxy's darkest hour, the highest stakes imaginable drive this hero in Battlenaut armor to seize his destiny. But can he overcome a soul-searing betrayal that strikes out of nowhere like the Reds themselves? Only by crushing the monsters of his own dark past can Scott vanquish the forces blasting humanity to the brink of annihilation.

Earth Solar System, the Future. Abigail Olivaw is drowning in self-doubt. Hiding a devastating secret from the populace, the President of the Confederation of Planetary Explorers is horrified when hostile aliens arrive to announce they’re putting humanity on trial. Forced to act as her species’ defender in court, she struggles to hide her family’s hidden multi-generational history that could lead to a sentence of genocide.
Epsilon Eridani Colony. Joyce Green’s passion for her job is dwarfed only by her love for her son. So when he dies from a mysterious virus that threatens the entire settlement, the Director of Colonization vows to stop at nothing to discover what triggered the deadly infection. And as she uncovers the truth bit by bit, her heartbreak fuels a berserk need for justice.
Trapped by guilt over a mistake she didn’t choose, Abigail falls into a tailspin when the invaders reveal the facts of her race’s origins. And when Joyce unmasks a traitor, the rest of her people would be lucky to only die from disease.
With their paths on a collision course, will the women’s consequence-laden decisions destroy humankind’s last hope?

An aggressive alien race bent on conquest. A colony world targeted for its deeply buried secret. And the aging spaceship with an unprepared crew that stands in the way.
Jay steals aboard the luxury warfare cruise confident he won’t get caught.
But he’s not there for the fun and games. Jay seeks to uncover mysterious missing links to his past. And it’s good that the grizzled old captain doesn’t know what he’s up to. Especially since he’s the reason Jay is there. He possesses a closely guarded secret about their connection that will turn both their words upside down.
But when an unknown and bloodthirsty alien race arrives to violently reclaim their planet, Jay and the unprepared wealthy clients of the luxury warfare cruise are the only things standing in their way.

During a time of interplanetary war, Baymond escaped heartbreak by joining the galactic air fleet. Now he faces death daily while living on a military space station far from his home planet. His latest assignment is to travel to a war-torn planet on a reconnaissance mission.
Meanwhile, Princess Fawniteen is expected to marry Prince Radcliff to form a political alliance between their countries. But when Radcliff’s father dies, she realizes she’s still in love with Baymond and wants control over her life.
Fawniteen breaks off her engagement and travels across the galaxy to be with Baymond. She joins him on what’s proposed to be a peaceful mission. Instead they find themselves cut off from the space station and war erupts.
When Baymond and Fawniteen become separated, he must face his hardest trial yet when he’s captured by the enemy when searching for her.
Will Fawn and Baymond survive their separation by war? Can Baymond draw on his unique gifts and defeat a powerful sorcerer-deity to save the galaxy?

Cloned from the genes of heroes past, tossed aside when the Army abandoned the program, Nathan Stout has seized his own destiny. Forming the Broken Arrow Mercenary Force, he leads a team of hired guns piloting cutting-edge mechs in a last-ditch effort to restore a United States he never knew.
America is under siege by the Russians and Chinese, its major cities devastated by nuclear terrorism. The Army has retreated, the politicians have abandoned the east coast, and the only thing standing in the way of total devastation is a handful of mercenaries.
But unseen forces are guiding the battles he fights, steering him toward a fate he never imagined, determined to end his dream of a reunited America. Can Nathan Stout’s mech force survive the machinations leading the world toward the hellfires of endless war?

An alien-infested colony. A trapped platoon. The one man who will stop at nothing to lead his unit to safety.
Rade Galaal and his team of special operators are deployed to a colony under attack by a strange new alien race. Their mission: find the extraterrestrial base and destroy it.
The operation should be easy, given that his men pilot Brigand mechs: massive, 25-foot-tall war machines armed to the teeth with electrolasers, rockets, incendiary throwers, and more.
But it's not easy. Rade and his team soon find themselves in over their heads.
Surrounded by an entire world of enraged aliens, they must rely on their wits, their training, and their mechs to survive.
Because their only way out is each other.

Dane Williams barely survived the Exin attack and is faced with a life of pain and torment. With the help of experimental drugs and a robotic suit, he has a chance for a semi-normal life. And as a new Marine in the Mechanized Infantry Division, he has a chance to strike back at the enemy that has caused so much pain and destruction. Can Dane and his fellow Marines fight back and save humanity or is Earth heading for an extinction level event?
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Sparks and Reyes thought they had it all figured out. Three lucrative jobs and a hefty payout, until they discovered the dark truth behind their missions.
Set up to fail and exploited for their skills, they must now decide between walking away with their credits, or taking a stand to right the wrongs of their past.
In a race against time and the corrupt Ringdell Group, they must choose between the easy path and what is right.
Can they undo the damage they’ve done, or will they be forever haunted by their choices?