Do women like it when men show emotion?

Ever since I was a kid, I wanted to be a United States Marine. I have been preparing myself since and one thing I have to do is show no emotion whatsoever. Every time I think of showing any kind of emotion it seems I will be weak, venerable, less of a warrior and be killed off. Now I think a warrior can't be in a relationship because they cannot show emotion of any kind. How can I be in a relationship with a women if I can't show any emotion?