Does anyone know what Vietcong used to cover tunnel entrances? Did they use wooden planks covered with dirt and vegetation or perhaps several bamboo sticks tied together and covered with some leaves and such?

Thanks

Yes, both methods were used. Also hid them under large wicker food baskets and animal pens/huts.

Thanks Gino, that is what I thought.

You hit the nail right on the head! both were used.