A Matter for Men by David Gerrold

This lengthy excerpt details events following devastating plagues that have decimated Earth's population, depicting a world facing a new threat from alien creatures known as the Chtorr. The narrative centers on protagonist James McCarthy, a scientist pressed into military service, as he grapples with the horrors of combat against the monstrous Chtorr and the ethical dilemmas faced by humanity in its struggle for survival. McCarthy's experiences range from tense reconnaissance missions and personal loss to unsettling observations of Chtorr biology and behavior. The text also explores the complex political landscape and the desperate measures taken by surviving governments and secret agencies in their fight against the alien infestation, highlighting themes of survival, adaptation, and the moral cost of war.