collect 4 book in 2 volume first here second here 4 books version available with audio here
Formed from cold steel and superpowered computing brains, these gigantic tanks with the firepower of an entire army have been the decisive factors in interplanetary battle. But are humans worthy of the extraordinary instruments of war that they have created? Read more

The planet is called Banshee. The air is unbreathable, the water is poisonous. It is home to the most implacable enemies that humanity, in all its interstellar expansion, has ever encountered.
Body armor has been devised for the commando forces that are to be dropped on Banshee—the culmination of ten thousand years of the armorers’ craft. A trooper in this armor is a one-man, atomic powered battle fortress. But he will have to fight a nearly endless horde of berserk, hard-shelled monsters—the fighting arm of a species which uses biological technology to design perfect, mindless war minions.
Felix is a scout in A-team Two. Highly competent, he is the sole survivor of mission after mission. Yet he is a man consumed by fear and hatred. And he is protected, not only by his custom-fitted body armor, but by an odd being which seems to live within him, a cold killing machine he calls “The Engine.”
This is Felix’s story—a story of the horror, the courage, and the aftermath of combat, and the story, too, of how strength of spirit can be the greatest armor of all.