3. Natural Selection

Ten hopeful recruits to the SAS face their final and toughest challenge yet - a three-day combat survival course in the Welsh mountains, where they must evade capture by 40 Paras while navigating rough terrain and swollen rivers. Mick Sharp hopes to join his mate Jamie in the regiment, but Henno is out to make life difficult for him. But when two soldiers are found dead, it appears an even greater danger lurks in the woods.