Suspend your disbelief, this is an action novel, i.e. Fiction, fantasy, call it what you will.
It out-Bonds James Bond, it out-Pitts Dirk Pitt. It is non stop from the start of training, whether it's jumping out of planes and helicopters, fighting the IRA in Ireland, the militias in Serbia or rescuing hostages in Africa, it is all larger than life and twice as much fun.
So he can perform heart surgery with a pocket knife and empty biro (it didn't happen), leap from tall buildings with a single bound and defeat a small army with a clapped out rifle, it didn't happen!
It is fiction and a WILD AND ENJOYABLE RIDE.