AA is right.
The bit where one of the blokes rammed the para's wheelchair to make him crash, would only boost his morale and aid his sense of normality.
I can't speak for other services, but soldiers are happiest when moaning, and making fun of each other
.
Never having been injured (luckily, and thank goodness) I have no idea what it would be like for anyone in the programme, but I do know that with the support of my (military) mates, I felt I could do anything, and had great self belief, as well as belief in those around me...That kind of kinship is literally priceless.