Jobs that relate to investing?

[Andrew Nocella]

I believe Robert Kiyosaki was the one who said to work in jobs that will build your skills.
I will have a major career change in the next year. I am currently in the Army and my contract will be up in a year, my wife and I are looking to a career change to a job that will help us build skills as we build a passive income through real estate.
What jobs have you found helpful in building useful real estate investing skills?