Matterhorn by Karl Marlantes

Excellent Vietnam novel by a decorated Marine Officer. Maybe the best Vietnam novel I've read (another good one is The 13th Valley). Although I was never in combat, or in the Marine Corps during time of war, I underwent the same infantry training as Marlantes (which he references periodically throughout the book), so I am familiar with the routine tasks of infantry platoon leadership like leading patrols, setting up defensive positions, setting out listening posts, periodic position checks during the night, etc. Marinates relates the responsibility that goes with all this, and the fatigue that results from never getting more than a few hours of sleep with something always to do - along with the stress and terror of combat on top of it. Highly recommended.