Try to get at least of 100 hours of nonclinical volunteering that involves working with the underserved (think soup kitchen, etc) so you don't have to rely on your military experience to compensate. Aside from that, a high MCAT (512-515+) will likely be needed for Vanderbilt but for your Texas schools less is needed (508-512 depending on the school). Your USAF experience will help quite a bit.
Let us know when you take your MCAT and we can provide a school list for you. Good luck!