'I had seen dozens of people die horrible deaths ... This time was different. This time it was a friend of mine dying in the dirt in front of me, and it was my job to save him.' Dr Dan Pronk served on over 100 combat missions in Afghanistan as a frontline special forces combat doctor, where the casualties he treated were his fellow SAS soldiers and commandos, local civilians and even the enemy. The thrill of adventure and the challenges of battlefield...