I don't think he's got much chance personally. He knowingly and deliberately violated a standard operating procedure. Add the magic word "Security" into the mix and everyone panics and bays for his blood.
Which is a shame, as I read his book a while ago, and although he comes across as opinionated and forever butting heads with those in authority, there's no denying that he seems like a good man, a decent human being and that he cares about his colleagues and the men who were under his command.
It seems that he was destined for greater things than a life in civvy street where the rules and regulations are always allowed to override common sense.
Good luck to him in the future.