Izz al-Din al-Qassam Brigades (IQB) – Hamas
The Izz al-Din al-Qassam Brigades (IQB) was founded in 1991 as the military wing of Hamas. It is the largest and best-equipped group operating in Gaza and has fought several wars against Israel. In recent years, it has significantly enhanced its missile and rocket capacity, and has experimented with drones and underwater commandos — with limited success. IQB also has its own internal security force (al-Majd).