Early SAS recruits mark unit's 70th anniversary
Seventy years ago, at the height of World War II, a young British officer called David Stirling came up with the idea of forming a specialist force to operate deep behind enemy lines.
It became known as the SAS.
A secret World War II diary of the British special forces unit is being published for the first time to mark the 70th anniversary of the regiment.
BBC Breakfast spoke to some of its earlier recruits.