The protagonist goes to Ranger School with live missions, succumbs to malaria and spends time in field hospitals and convalescent center.  Joins a psychological operations unit that tries to scare the enemy, visits a holy city and witnesses the hopeless attempt to win hearts and minds.
Book Summary

Landing Zone -  A serial novel about the Vietnam War                              Volume 6
"Vietnam, a war we should have never started, nor lost." Carlos L. Arce
The writer served as a combat infantry sergeant in the Vietnam War during 1969-70. He is presently a 100%, service-disabled, American war veteran.