If I were giving a quick answer to your question as to whether or not Canadian soldiers are overmedicated, I'd say no, they're undermedicated. It is extremely difficult to get patients to accept SSRIs; it doesn't matter whether they're military or civilian.
I don't know what the statistics are. My suspicion would be that if you looked at the use of psychoactive medication in military personnel versus civilians, it would be higher in military personnel, and not because military personnel need them more but because we are able to pick up on them more often and are able to offer them treatment. In the civilian world, many people just never go to a doctor, particularly now when it's so difficult to find a doctor. It's much easier to detect the need in military personnel, and even then it's difficult to get them to take it.
If they are severely disabled from their illness, whether it is a mental illness or hypertension or cardiac disease, we have systems in place to ensure that they will not be deployed until the problem is fixed.