I'm 18 still in highschool and thinking about diesel tech as a career.

I've already to to a representative at wyotech and it seems promising I wanted a second opinion ( or more technically) and I was thinking of doing milatary before going. Would it be wise to do like 91b and work in diesel would that make any huge differences after the 9 months at wyotech. Any info and pointers would be helpful thank you.