Hugs!
There are many girls here with prior or even current military experience. Ask them. I haven't served in any military in my life, although I took Army ROTC training in college for more than a year, so I know at least something about it.
I concur with the other girls here...do your homework before you "come out" to important people in your life...
I live in Latin America now as a University Professor. I have a beautiful genetic (cis) girlfriend who is 26, and she likely will move into my apartment about August 15 she tells me she wants to. She accepts my developing breasts. I am only 6 weeks into strong HRT (female hormones), but just in the last few days both males and females have started staring at my rather obvious small breasts and protruding nipples. Wow is it amazing I feel great to have people stare at my breasts!

If you learn that you are if fact female, these hormones are very powerful, and will MAKE you even more female, both physically and mentally. The changes are truly effective and amazing, and beyond my dreams -- especially the mental happiness and euphoria, for me at least, and maybe for you.
If your female significant other is accepting, then it is fine if you transform your body into a girl you can still be attracted to her and love her. I speak from my own experience that I still feel attractive to, and love, my beautiful 26 year old genetic (cis) girlfriend. Just note that my sex drive went WAY down just 3 weeks into HRT (taking female hormones), so be ready for that, if you decide your are female gender.
A big hug, and welcome to our family here!
Johanna.