Are you an honorably discharged veteran Drett? I am. Or, more likely, are you an armchair general hypocritically calling everyone else an armchair general?
No need to answer Drett. The British armed forces doesn't take Muslim potheads into its ranks.
There are legitimate mechanisms in the military that enlisted personnel can use to stand down from combat. They range from a request for a temporary period of evaluation away from the front line to permanent reassignment and even an honorable medical discharge for mental health issues.
What you don't do is leave a note saying bye and saunter off with some locals because you've become disillusioned with the war. That's desertion and usually results in a court martial with a military prison sentence followed by a dishonorable discharge. In times of war, it can be punished by life in prison or a death sentence.
Five Muslim terrorists have just been released by the Obama Administration, in what looks like an illegal trade, to get him back. They'll go right back to what they do: terrorism to further Islam. But it's all good because you're a Muslim right Drett?