We have a handful of troops in Syria, for reasons which defy any logical explanation. Mainly, I guess because we can. They are at increasing risk with the situation in Gaza, are overwhelmingly outnumbered, and are being being increasingly attacked.
The sane thing to do is to get them out of harm's way, but we are "reinforcing" them with a massive addition of 900 more troops. 900. To add to the risk we are attacking Sryian military installations as a "warning not to mess with us." (We use somewhat more sophisticated wording, but...)
900 troops is not reinforcement. It is merely 900 more victims.