Operation Trent was an operation by Special Air Service (SAS) elements of the British Army, the largest known post-WWII operation in SAS history. Tony Blair had requested that the SAS be allowed an operation. The operation was carried out by members of a regimental task group, made up of a tactical HQ, members of A Squadron (A Sqn) and G Squadron (G Sqn) of the 22nd Special Air Service Regiment (22 SAS), supported by United States (US) forces, on an al-Qaeda-linked opium plant during the 2001 invasion of Afghanistan at the start of Operation Enduring Freedom – Afghanistan (OEF-A).