People's Defense Units

The People's Defense Units (YPG), also called People's Protection Units, is a mainly Kurdish militant group in Syria and the primary component of the Syrian Democratic Forces (SDF).

The YPG mostly consists of Kurds, but also includes Arabs and foreign volunteers; it is closely allied to the Syriac Military Council, an Assyrian militia. The YPG was formed in 2011. It expanded rapidly in the Syrian Civil War and came to predominate over other armed Syrian Kurdish groups. A sister militia, the Women's Protection Units (YPJ), fights alongside them. The YPG is active in the Autonomous Administration of North and East Syria (Rojava), particularly in its Kurdish regions.

In early 2015, the group won a major victory over the so-called Islamic State (IS) during the siege of Kobanî, where the YPG began to receive air and ground support from the United States and other Combined Joint Task Force – Operation Inherent Resolve militaries. Since then, the YPG has primarily fought against IS, as well as on occasion fighting other Syrian rebel groups and the Turkish Armed Forces. In late 2015, the YPG became part of the SDF, an umbrella group intended to better incorporate Arabs and minorities into the war effort. In 2016–2017, the SDF's Raqqa campaign led to the liberation of the city of Raqqa, the Islamic State's de facto capital. Several western sources have described the YPG as the "most effective" force in fighting IS in Syria.

According to Turkey and Qatar, the YPG is a terrorist organization, closely associated with the Kurdistan Workers' Party (PKK), which is listed as a terrorist organization. The flag of the YPG is also a banned symbol in Germany as per Strafgesetzbuch section 86a, although the organization itself is not recognised as terrorist. Finland and Sweden's alleged support for the YPG, is one of the points which caused Turkey to oppose Finland and Sweden's NATO accession bid. In June 2022, Finnish President Sauli Niinistö announced in Madrid, after the agreement with Turkey, that Finland does not see the YPG as a terrorist organization and that Finland will continue to support the YPG. The Turkish terror classification is not shared by key international bodies in the fight against the Islamic State in which the YPG takes part. Due to this Turkish view, US Army Special Operations Commander General Raymond Thomas suggested the YPG to change their name, after which the name of the Syrian Democratic Forces (SDF) was found.

A light infantry force, the YPG has limited military equipment and few armoured vehicles. According to the Turkish state-run Anadolu Agency, the US military provided US$715 millions in weapons and equipment aid to the political party Democratic Union Party (PYD) and YPG. Among the heavy weaponry provided are TOW American anti-tank missiles.