Earlier in my career, I was responsible for recruiting medical personnel into the Canadian Forces. That said, this is perhaps something that you will have to ask the Canadian Forces, because Veterans Affairs Canada is not responsible for recruiting medical personnel. If I had not had that job, I would not have been able to tell you that because I would not have known it.
I don't know if there have been changes since I left my job with the Canadian Forces. You would really have to ask the Canadian Forces how their medical personnel goes about identifying mental health problems among recruits.