In Alien Hands

Jim Endicott is a man with a secret - hidden even from himself. Encoded somewhere in his DNA, entwined with the mystery of his birth, is a cybernetic weapon that can alter the balance of power in the galaxy. Yet all Jim knows is that he has been turned down by the Space Academy and rejected by Cat, the woman who taught him to love.
On a planet where life itself is for sale, Jim becomes a mercenary, a warrior for hire to the highest bidder. There, in an unforgiving campaign of planetary conquest, Jim assumes for the first time the imperatives of command, and learns the first and most difficult lesson of his career. Amidst the horrifying brutality of high-vacuum war, he discovers which side he is really on.
This carefully researched adventure is complete with a special bibliography designed to assure scientific accuracy, provide essential guidance, and suggest fascinating new directions to explore.