Boy this is a tough one.

You must beyond adoubt support him, fighting for ones country is truly a noble endeavor, and when the fight is also a righteous one for the preservation of the american way of life then it is an honorable cause as well, to have loved ones support and stand by you in such endeavors is an unmeasurable act of faith and love.

I would pray for him every single day, that God watches over him and then he returns to you as blessed as before he left, there really is not much more you can do aside from that.

Good luck.