One of the problems faced by anyone considering this question is that the more you read about it, the more conflicting opinions one will find. One magazine writer several years ago suggested that neither military exprience nor hunting experience (sucessful hunting, I presume) adds much to one's self-defense capability. I wonder about the first claim, not so much about the other.
I do believe my past military training and combat experience has added to my self defense capability and has allowed me to overcome the mental problems associated with taking another persons life. Does military experience prepare everyone, No! As we all know many people that experience a traumatic experience don't have the ability to overcome the experience and suffer from the effects the remainder of their lives.