This war is known to many as being one of the most pointless wars that the United States has ever fought

The Vietnam War was a lengthy and expensive armed conflict that matched the communist regime of North Vietnam and its southern allies, known as the Viet Cong, against South Vietnam and its main ally, the United States of America. The war started in 1954 and lasted until the fall of Saigon in 1975.
This war is known to many as being one of the most pointless wars that the United States has ever fought. So many men were killed, became sick from Agent Orange or suffered PTSD that made coming back home harder than ever.

Having your guard up at all times was crucial in this war. Especially  with terrain like this where it was easy for the opposing soldiers to hide.