Britain’s Special Air Service or SAS was the brainchild of Colonel David Stirling. This young, gadabout aristocrat displayed an aimlessness in early life that belied a remarkably strategic mind. Stirling envisioned a small group of elite, well-trained men who could wreak havoc behind enemy lines. The SAS’ remarkable exploits during WWII became the model for many of today’s Special Forces units. Johan Sorensen joins Ben Macintyre as he shares his unprecedented access to SAS archives to shine a light inside a legendary unit long shrouded in secrecy.