 Complete the following phrase:  On 18 February 2008, Taliban leader Mullah Abdul Matin and one of his sub-commanders, Mullah Karim Agha, along with several bodyguards were travelling through the desert near Gereshk, Helmand province on motorbikes when they were ambushed and killed by an SBS unit dropped into his path by helicopter. In February 2009, members of the SBS took part in Operation Diesel, which resulted in the seizure of 50 million of heroin and the killing of at least 20 Taliban insurgents. On 29 August 2009, Sergeant Lee Houltram of the SBS was killed by an IED during a Special Forces operation to destroy a bomb factory near Gereshk in Helmand province. On 9 September 2009, an SBS team supported by the Special Forces Support Group SFSG rescued Times journalist Stephen Farrell from a Taliban safe house in Char Dara District, Kunduz Province after he and his Afghan interpreter had been captured by the Taliban while reporting on the 