So no I don't think your wife has anything to do with your great grandfather. What I would suggest is the possibility that you two were married in a past life. And by the way you may have been the wife.
As far as tendecies toward some militaristic manner, and whether or not that is some kind of link with a past life, I would say thats more of alink to your present life That's not who you were, thats who you are.
Also don't forget that in the ways of mankind as we all know too well, many are warriors. Indeed one of my clients described how he had a "kill gene" in him that truly made him want to go and kill people (don't worry he's in for life).
I look at all human type traits we possess here on earth as more from genetics, which as I understand it have no connection to past lives. How you live out your life is supposed to determine your situation in your next life.
If you have no birthmarks maybe it means you lived a long life and died of natural causes.