From its early beginnings in World War II, the Special Air Service (SAS) has won renown in some of the most dramatic, dangerous, and controversial military special operations of the 20th Century. It is a secretive and mysterious unit, whose operations and internal structures are hidden from the public eye. Now, one of its longest-serving veterans, Rusty Firmin, offers a glimpse into the shadowy world of the SAS. Rusty Firmin spent an incredible 15 years with 'The Regiment' and was a key figure in the assault on the Iranian Embassy in London in May 1980, the near-suicidal planned attack on Argentina (operation MIKADO) during the Falklands war, and the secret conflict between the SAS and the IRA in the 80s.