Americans must destroy these tunnels to make it harder for Viet Cong to hide.
To do this, kitchens in the tunnels are very close to the surface so you can see where the smoke is coming from. The smoke will help indicate where the tunnels are and would be easier to capture.
A way to stop these surprise attacks would be by using poison gas. American soldiers should use poison gas before entering the forest to make sure there wouldn't be any enemies that would attack. This would cause them to run off and decrease high casualties, which would give the South Vietnam an advantage at winning the war.