Dex Halford is John Chance's best friend and they were both in the SAS together. He walks with a limp due to the fact he lost a leg in Afghanistan.
In Sure FireEdit
In book 1 Dex is first mentioned in the Prologue when he and John blow up a oil plant. He comes into the story again later when Ardman puts Jade and Rich in contact with him so he can help them rescue their father who has been kidnapped.