Like anything, I guess, when anyone changes their career, there are probably multiple reasons. I think the biggest cohort who leave after their obligatory service, after their training.... For example, when I joined, my goal actually was just to pay for medical school. My intention was to serve my three years. My full intention at that time was to leave the military. I actually really enjoyed my experiences, both with the units in Petawawa and then with the Canadian special forces, and I elected to stay.
It's like anything. I think some people just find that the military is not for them. Like any other job, they may find that it's not for them. Most people, I think, leave after their obligatory service if they were funded through medical school.