The additional forces that had arrived in "the last few days" comprised a Marines artillery unit and Army Rangers. The artillery unit sent to the anti-Islamic State battleground is from the 11th Marine Expeditionary Unit and is equipped with highly potent 155mm M-777 howitzers. The artillery unit is from the 11th Marine Expeditionary Unit and is equipped with highly potent 155-mm M777 Howitzers. Their task is to perform fire-support missions for the US-backed Syrian Defence Forces (SDF) composed of Syrian and Kurdish fighters, in offensive operations on Raqqa. The SDF is the main US partner in the war against Islamic State in Syria.
Source: Bangkok Post March 09, 2017 18:07 UTC