We All Died at Breakaway Station
Richard C. Meredith
Ballantine Books 
Synopsis: Three starcraft, the Iwo Jima, the Pharsalus and the Rudolph Cragstone, arrive at Breakaway Station, a link in the chain of FTL communicators between Earth and its colonies in the Palantine. The three craft are crewed by the half-dead, people who are just barely able to be made operational using extensive cyborging. They are carrying a cargo of even more badly wounded military personnel from the on-going war with the Jillies, a race of hideous, inscrutable aliens who have declared a war to the death with humanity.