Kameron Hurley’s 2020 The Light Brigade is a stand-alone military science fiction novel.
Having been rescued from democracy and socialism, the dwindling population of the Earth prospers under the prudent guidance of their corporate rulers. Those who are useful are rewarded appropriately (but not excessively); the useless are discarded. All is for the best in the best of all possible worlds.
Dietz’ father was a criminal who was eventually disappeared. Dietz’ mother died of a terminal illness. Dietz’ brother vanished in the Blink, an attack that erased a swath of Sao Paulo. The attack inspires Dietz to join a corporate army to get revenge on the damn dirty Martians who attacked Earth.