Need advice on how to explain to bf

Hi! My bf of 3 yrs and i are both in college. He wants a job in homeland security which requires military service or 5 years as a cop. I have tried to have him consider joining a military branch while continuing his education. This aould help take 3 years off so he can get his dream job faster. He of course doesnt hear me out and just wants to enjoy being in college and partying. As his gf i want to push him to be his best and focus on what he wants to do as a career. It just doesnt make sense to waste 5 yrs for a job to get the job you want when you can join a branch, go to school and make connections. Did anyone else's bf/husband do anything similar. Obviosuly I just want him to look into all the benefits that path has for his career. Any help?