Warstrider — William H. Keith Jr.

THE ENEMY WAITS.
ITS ORIGIN IS UNKNOWN.
ITS MOTIVES ARE NOT RATIONAL.
ITS WORLD IS INCOMPREHENSIBLE.
IT IS NOT HUMAN.

Dev Cameron was planning to join the Navy when he was drafted into the Guard--"groundpounders' consigned to do the dirtiest work of interplanetary warfare. But before the situation can be rectified, the reluctant warrior's heavily armored unit is rocketing to the stars to do battle with the Xenos--an inscrutable, illogical and terrifying race of alien monsters committed to the annihilation of all other galactic species. And with Armageddon at hand, the last hope of survival for Dev and his world is the Cephlink--an awesome extension of intelligence, memory and power that can take Man one giant step beyond the limitations of the flesh.