1989’s A Rage for Revenge is the third volume in David Gerrold’s The War Against the Chtorr series: a multipart tale of the ongoing and highly successful efforts of an alien ecosystem to remake Earth in their image.
Lieutenant James McCarthy signs up for Mode training, which is a bit like ESTif EST were to involve more verbal abuse and threats of physical violence. It soon becomes clear that McCarthy suffered something even worse than his usual bad luck. Cue lengthy flashback!
Readers triggered by child abuse will want to stop reading right now.