Syrian Turkmen, with the support of the Republic of Turkey, have taken up arms against the Syrian government. Several Syrian Turkmen parties united under the Syrian Turkmen Assembly, which is affiliated with the National Coalition opposition group. A Second Coastal Division was formed in 2015 and along with another extensive Turkmen militia group Sultan Murad Division, the Turkmen brigades are closely affiliated with the Free Syrian Army (FSA). Another Syrian Turkmen unit – the Seljuk Brigade and the Manbij Turkmen Brigade – have sided with the Kurdish-led People's Protection Units (YPG) and joined the US-backed Kurdish-led opposition coalition called the Syrian Democratic Forces (SDF).