You can't fly in the military unless you're an officer. You can't be an officer unless you have a degree. Unless you're going to the academy I'd do ROTC or the reserves until you finish school.
PS: There are other schools out there that don't cost as much as ER and they'll teach you to be a good pilot. In fact, I'd read the threads on here about with the opinions on aviation degrees.
Do what's right for you, all the advice in the world doesn't mean ******* unless you follow what youw ant to do.