As a military wife (whose husband is in a cap badge with a high proportion of women) I can see where you're coming from. However, support will vary depending on your circumstances.
If you're on the patch then the support is there via your wife's UWO. There may be informal support via the patch community (coffee mornings, book clubs, other social activities) and it is just a matter of reaching out and letting people know you're there.
If you work, then these things may be more difficult to access as they often happen during the day, so are more accessible by non-working spouses. If you are in your own home, especially if you are some distance away from your wife's unit, then day-to-day support will be difficult to access but support in case of an emergency should be there. If your wife is Reserve but currently serving full-time on deployment or attachment, the same may be true.
It is a fact if miltary life that the majority of spouses are female, and support is geared around that - however, any event run by the unit etc is open to all spouses, regardless of sex.
What can be more difficult to access is the informal support network - socialising that's done in people's quarters - these groups are somewhat organic and can feel "exclusive" (by rank/gender etc) and it can feel like a struggle to fit in.
My only advice, if it's applicable to your individual circumstances, is to try and join in with one or two "official" groups (coffee drop-in at your community centre etc - the UWO should hold details of what happens when on camp).
If your wife's Mess holds guest nights, go along and meet the other spouses and you might find an "in" to the informal socialising/support network.