When I was at MASUAS (staff) some years ago we had a number of medical students who, as the rules were then, had to join the UAS because they were on cadetships ie on RAF Pay. They were way too busy to play a useful part in the life and work of the UAS and they were taking up slots that could have been filled by people who did have the time to turn up! One year the CO wote on a medical cadet's annual report "I have never met this officer"!