The main special forces unit of the Pakistan Army is the Special Service Group (SSG), also known as the “Black Storks,” and it was formed in 1956, when they based much of their initial training and orientation on that of the U.S. Special Forces. The SSG is headquartered at Tarbela Cantonment and is divided into eight battalions with their leader being a major-general. Their most recent operation has been Operation Zarb-e-Azb, targeted terror groups in the region, including Islamic State and al-Qaida.