I once tried to become a paramedic. I was working in a sort-of outpatient clinic at the time, talked a couple of times with an paramedic instructor, along with some regular officers. I never got in - the HR recruiters didn't like me for some reason. This made no sense to the instructor, who thought I was a prime candidate, nor to my medical colleagues, and I also later successfully coached two friends through the process. I often wonder how life would have turned out differently had I been accepted. Sometimes people on both sides of the wall think you'd be the best for the job, but if the gatekeepers don't think so... :)