Hammer’s Slammers # 1: Hammer’s Slammers by David Drake

When a planetary government faces threats from guerillas, insurgents or terrorists, the men they hire are Hammer’s Slammers – known throughout the galaxy for their cold, ruthless ferocity, their ability to defeat overwhelming forces, and their willingness to go up against impossible odds.
The Governor, to whom Raj Whitehall has sworn absolute loyalty, nourishes a paranoid envy and mistrust that grows with every victory. Can even a battle computer of the Galactic Age be enough to counter the fury of Raj’s enemies – and the treachery of his “friends”?