21st Force Union, a Syrian Opposition faction counted as part of the Free Syrian Army, which was known as 101st Infantry Division. It has strong relations and contacts with some countries, including Turkey, GCC and USA.
The faction is lead by Col. Hasan Mari Hamada, a Syrian Army pilot who defected with his warplane (MiG-21) to Jordan in June 2012. Large number of TOW ATGM were provided from USA to the faction, as well as the faction has many Syrian Army defected officers who are taking responsibility to lead the military operations.
In December 2015, when it was known as the 101st Infantry Division, the faction announced that they merged with Fursan al-Haqq Brigade in the “Northern Division” , but they left this new formation as the Northern Division has merged with more factions and formed “Idlib Free Army” in September 2016.
21st Force Union has almost more than 1,400 fighters, including many officers, active mostly in Aleppo and Idlib provinces, involved in most battles against Assad Regime forces and allies (Hezbollah + IRGC).