I'm the only person who wanted to say "You're automatically a vet after getting out of the army"?
C'mon, people.
Anyway, Gwen pretty much covered it. Given your current situation, the steps you take are: 1) Investigate the vet-school pre-reqs by visiting the websites of a variety of vet schools, starting with your In-State school, 2) Investigate the industry by spending some time with a few different types of docs, 3) Understand that its a long play to get into vet school, not something you decide today and apply tomorrow.
You'll need somewhere between 250 and several thousand hours of experience (working, shadowing, volunteering, whatever) in the industry. Most people probably apply with at least 400+. You'll need decent GPAs (at least 3.5 range is best). You'll need some recommendation letters from people, including at least one or two veterinarians.
I don't really know what getting out of the army has to do with it that would be unique to anyone else getting in (as far as preparation for vet school), but maybe
@Armymutt25A has some thoughts on that. With regard to limited opportunities .... I dunno. Assuming you're talking about pre-requisite classes, the best thing you can do is make a list of all the classes you need to apply to the schools you're interested in, and then start researching where you can take them, making sure that the classes you're looking at fulfill the pre-requisite requirement. I had an excel spreadsheet with all the pre-requisites, arranged in the order I had to take them (chem 1 -> chem 2, etc). It made it nice and easy for me to track my progress (which helps keep you from getting depressed at the process), as well as making sure I didn't miss anything.