Use the base vet for routine stuff, e.g. shots. You pay only a nominal fee, 2-3 dollars for the doctors visit, plus the cost of the meds. Also, heartworm prevention meds are less than 1/2 the price of a civilian vet's. They won't do any serious procedures, like spay/neuter or any surgery, though. Plus, it takes awhile to get an appointment.
I took my dog to the vet on Avalon Blvd a few times. They were pretty good.