First off, welcome to Susans, eh?
I'm about your age, been married to my wife for 4 years now, and I have a preschooler with another on the way in a few months. Similar in those respects at least. I've tried about 5 or so times to come out to my wife, and each time has gone better, but still stuck in the closet over here. I'm finally going to an appointment with the right people in a week... possibly starting lowdose HRT soon thereafter.
I'm not military, and the US is starting to turn the corner on allowing open Trans* folks in the military...
All I can say is figuring this out when our public lives seem to be going so well... really screws up plans for the future for both your family, and your intended goals. People expect you to continue in the life you've chosen to lead... and when you throw the T wrench in... Well, hopefully there's someone around to catch you when you fall.
That's why Susans is here. To be here for support, no matter where you are in your journey. People here are from all over, in all sorts of situations, from every walk of life. Someone here has probably gone through something similar to what you're experiencing.
I'm still not out, and I'm still working on how I'm gonna break it to my wife another time. This isn't easy. But I know when it goes down, and whatever goes down, people will be here to read, and to listen. We gotta stick together.
I hope you can find local support, wherever you are, and if you can't - the light's always on at Susan's.
Hang in there, we're all in this together