To be fair, and based on my own knowledge, experience, and assumptions, he might have completed his HND in the Army. it's approximately a two years apprenticeship. Then he could have completed his final year at Hull Uni.
He might have had to serve his apprenticeship for more than two years.
But that would mean, that if he did serve in Afghanistan and/or Iraq, it would, have been in a support role, and not a frontline role.
Despite his claims of frontline service.
Of course there's no guarantee that he met the criteria for the BSc or BA in Computer Science, or that he even completed the course. The exam and scoring of a classroom teaching scenario has much more scrutiny than an apprenticeship,