U.S. Army UH-60 Black Hawks take off for a joint aerial patrol of the security mechanism zone with Turkish military helicopters in northeast Syria, Sept. 5, 2019. The security mechanism is intended to secure and stabilize the Turkey-Syria border in a sustainable manner, ensure campaign continuity in the Global Coalition's efforts to defeat Daesh, and limit any uncoordinated military operations. The security mechanism will be executed in designated phases and in a coordinated and combined manner to ensure security and stability along the Turkey-Syria border. (U.S. Army photo by Spc. Alec Dionne)

A U.S. Army UH-60 Black Hawk helicopter conducts a joint aerial patrol of the security mechanism zone over northeast Syria with Turkish military helicopters, Sept. 5, 2019. The security mechanism is intended to address Turkish security concerns, maintain security in northeast Syria so ISIS cannot reemerge, and allow the Coalition to remain focused on achieving the enduring defeat of ISIS. The U.S. and Turkish militaries are currently executing concrete steps together to ensure the border area in northeast Syria remains stable and secure.

U.S. Army UH-60 Black Hawks take off for a joint aerial patrol of the security mechanism zone with Turkish military helicopters in northeast Syria, Sept. 5, 2019. The security mechanism is intended to secure and stabilize the Turkey-Syria border in a sustainable manner, ensure campaign continuity in the Global Coalition's efforts to defeat Daesh, and limit any uncoordinated military operations. The security mechanism will be executed in designated phases and in a coordinated and combined manner to ensure security and stability along the Turkey-Syria border. (U.S. Army photo by Spc. Alec Dionne)