The 13th Valley by John M. Del Vecchio

A work that has served as a literary cornerstone for the Vietnam generation, The 13th Valley follows the strange and terrifying Vietnam combat experiences of James Chelini, a telephone-systems installer who finds himself an infantryman in territory controlled by the North Vietnamese Army. Spiraling deeper and deeper into a world of conflict and darkness, this harrowing account of Chelini's plunge and immersion into jungle warfare traces his evolution from a semipacifist to an all-out warmonger. The seminal novel on the Vietnam experience, The 13th Valley is a classic that illuminates the war in Southeast Asia like no other book.