This might be really quite important news.
Jaysh Maghawir al-Thawra
previously called the New Syrian Army
https://en.wikipedia.org/wiki/Revolutionary_Commando_Army
So the al-Tanf Enclave, is one of those strange places that holds displacement camps and American camps and special forces.
It has three way passage between Jordan, Syria & Iraq, which means that contractors can shift between these different states, then shelter, in the American held Enclave.
Very similar to how the Islamic State Enclave worked, against the Golan.