As a candidate who interviewed last time, I strongly urge you to start trying to address that lack of experience with military members immediately. The school wants to see that you have a commitment to service.
You can demonstrate that by tons of service hours to your community and being able to talk about that in detail. You can also start pursuing research into what military service is like.
This go around, I'm now a volunteer with the USO, I'm spoken to tons of friends whom were former or current service members, I've done lots of research on the medicineandthemilitary website (Dr. Forsberg, Dr. Winegarner are some examples). In addition I've read books by military physicians (Dr. Rhee, Dr Cole, etc). I've also read books on military leadership (General Powell, General Mattis, Jocko, etc). Finally through networking I've been able to get in touch and have conversations with current military physicians both on the pros and cons of military med and what makes a good military physician. There's tons of material out there you just have to look into it!
Those are my suggestions on what to work on, goodluck!