This is Philip Caputo’s nonfiction memoir, A Rumor of War. The author was Marine infantry, so I imagine if you want a hint of what PC may have experienced, this might be a good place to start.
Matterhorn by Karl Marlantes is by another Marine. This one is fiction, but is based on his infantry combat experiences in Vietnam.
For a film that considers the war from various perspectives, The Vietnam War by Ken Burns is an 18-hour documentary with firsthand accounts from nearly 80 witnesses, including US and Vietnamese combatants and civilians.