My brother did the wilderness thing in a group.
No showers, no latrine, no tent. Sleeping under green foliage and sharing the jungle with a thousand NVA.
When they ran out of NVA a helicopter picked them up and moved them to a different part of the jungle where there were more NVA. They had green boots.
Never saw a tent for 6 months.
My thanks to your brother. It's a harsh life.
/johnny