Don't worry too much about airlines for now. Flying a twin-engine fighter in the guard (especially one with high curb appeal) will set you up just fine for the airlines, both in terms of resume and network. Yes, the multi-time counts.
At some point you'll probably want to look at civilian time building since it could take many years of military flying to meet airline flight-time thresholds. But you can worry about that once you run out of active-duty status flying opportunities.