 Complete the following phrase:  The Gulf War, in which A, B and D squadrons deployed, was the largest SAS mobilisation since the Second World War, also notable for the failure of the Bravo Two Zero mission. In Sierra Leone it took part in Operation Barras, a hostage rescue operation, to extract members of the Royal Irish Regiment. Following the September 11 attacks on the United States by al-Qaeda in 2001, 2 squadrons of 22 SAS, later reinforced by members of both the Territorial SAS units, deployed to Afghanistan as part of the 