You would have to sponsor her as your spouse. Nothing is automatic, she doesn't automatically get US citizenship thru marriage to you, first she has to apply for permanent residency, and then after 3 years of PR she can apply for citizenship if she wants (she doesn't have to, she can remain a PR for life if she wants, many do).
For info on marriage based immigration see
http://www.visajourney.com There are quite a lot of military couples there.