When the US leaves an area they also leave a lot of expensive armament. It is just so expensive to take out (but not bring in).
This off the record military foreign aid. How can the US be sure who gets it? Maybe it doesn’t care so long as the pot keeps getting stirred.
One thing for $ure, it all ha$ to be replaced.

On Thursday, the Syrian Arab News Agency (SANA) released a video showing of the weapons and ammunition captured by the Syrian Arab Army (SAA) and the Tiger Forces from ISIS in Mayadin city.
The video showed that the SAA has captured dozens of light, and heavy machine guns and sniper rifles. The SAA also captured several anti-tank weapons including at least 3 Russian-made RPG-29. In addition, 2 unidentified man-portable air-defense systems (MANPADs) were captured by the SAA. The SAA also seized more than 20 drones, and what appears to be some ISIS made DIY drones.
The SAA also captured the following heavy weapons:

