Great question. There is absolutely nothing wrong with finding someone outside your MOS and picking their brain for mentorship and professional development. I think looking for a mentor is a hard job. Usually I found mentors in leaders of my battalion that did not even know they were my mentors. Funny point is I was mentored more from my bad leaders then the great ones. The bad ones teach you what not to do but they also teach you how to stretch yourself to evolve and work through difficult issues. Keep in mind our character is not defined by what we do when times are good but how we behave when times are bad. I know I did not give you a specific answer and that’s because in my experience I stumbled into my Great mentors, the rest of the time I learned from those around me. You might find some good information in a book titled: Move out Leadership. You can find it in your local clothing and sales store or at GIpubs.com