Answer:
They knew the terrain and jungles, and they blended themselves well with civilians.
Step-by-step explanation:
The Viet Cong had the advantage during the Vietnam War as having lived before the war allowed them to know the areas along with the jungles. They obtained military supplies from neighboring Communist countries. They set traps and conducted ambush against American soldiers. The Viet Cong were able to fight independently and blend with civilians as they have something to fight for.