Can a National Guard personal have a Military Wedding? And what would be the Dress Uniform?

Yes, look at AR670-1 and wear occasions of retirees, former soldiers and ARNG/USAR. The appropriate uniform would be the ASU worn as dress blue. You may do full size medals or ribbons, pick one. The Groomsmen, if Military, should be in the same uniform.

If the wedding is before 1800, the tie is worn with a four in hand knot and headgear. If after 1800, the bow tie without headgear.

Yes you can. The issue at hand will be the logistics. Even in the Active Component folks avoid doing it due to the headaches, but it can be done with timely and proper coordination.

A couple of guys I served with wore their Class A's when they got married.