Veterinary schools are as hard or harder to get into than medical schools for human doctors. In order to have any chance at admission, you need top grades from a respected college, not online courses from some fly-by-night school. How do you think you can do chem lab, biology lab, physics lab or organic chem lab online? That obviously isn't going to work, is it?
The best you can do is take some general education courses like English, psychology, a foreign language, or history. Then when you get out of the service you can use your GI benefits to pay for a top university education. Be sure to take your online courses from a respected brick-and-mortar school like Penn State or some other real school, not from one of these shabby $$$-sucking fake schools.