I'd treat him the same as I'd treat the abuser of any other drug like alcohol.
He got caught.
I would have dobbed him in myself if I had seen it. Not because I believe myself that there is any difference between drugs and alcohol, but because thats the rules.
He has paid the price for his disregarding the HM Forces drug policy.
That does not mean the rest of his life should be ruined and cheered along by his ex mates.
Did the crime and done the time.
Now why not let him get back to doing what his career suggests he does well?