US forces patrol Syrian border amid clashes between Turkey and Kurdish militants
By: Shawn Snow, April 28, 2017
As clashes continue between NATO ally Turkey and Kurdish militant group the People’s Protection Unit, U.S. forces are patrolling the border region in an operation reminiscent of the “reassure and deter mission” launched in Syria in March.
In that case, U.S. Army Rangers were sent to the Syrian city of Manbij to deter Turkish aggression against the United States' Kurdish allies in the fight against ISIS.
http://www.militarytimes.com/articles/us-forces-patrol-syrian-border-amid-clashes-between-turkey-and-kurdish-militants