Bankline is the favorite of many military folks that go into remote places with minimal equipment. It is strong, UV and rot resistant. It takes most knots well and easily untied. Although the original was coated with a smelly tar substance, the last batch I ordered had no smell.

I use it for "primitive" construction and have seen it last for several years in extreme environments. It remains strong and knots stay tied even underwater.

I would bet that if you were to inspect the gear bags of those soldiers you would find more bankline than paracord.

Here is an amazon link

That said, I do not use it for most applications. I have been using the type of cord found in Venetian Blinds which is also UV resistant and strong enough for my use. It is braided, not twisted. Just a matter of personal preferance.
...........From Nomad.........Been "on the road" since '97