The US forces already left. That’s why the Turks are attacking.
Turkey is a NATO ally. Syria is aligned with Russia.
If US forces were to get involved it would be on the side of the Turks, per NATO treaty. Why on earth do you want to help Assad defend his border?
We should be equally opposed to Erdogan AND Assad. And Turkey in NATO and Turkey as ally needs serious reconsideration. Turkey needs to booted from NATO, it needs to be disarmed.
Why on earth would you want to help Erdogan?
Let them kill each other off.