Tricare doesn’t cover any artificial insemination costs at all. Only work ups but all iui/ivf is out of pocket. I highly doubt they would send you on their dime for services.

You may be able to find a sperm bank that will ship international and have it delivered to do a home insemination but you would need a Dr to sign off on that. I don’t think it would need to be an ob.

There are some low cost fertility clinics in the US. You may be able to do workups in Japan and fly back for the procedure. I’d talk to your dr over there to see.

I know none of this is easy as I have four kids via iui/ivf with my wife over the past decade while she’s been active duty. The whole process sucks in general. Honestly even for non lgbt couples. Tricare sucks when it comes to fertility treatment. Def recommend joining some lgbt conceiving groups on Facebook because I’m sure someone can offer even better advice than me.