Thanks for your service first of all. If you completed your service complete and honorably, there is nothing to feel bad about.
I look back and wish I had at least went into the guard. I come from a family where I am one of the few that didn't serve. I regret that, but at the time my dad had been drafted for Korea and when a farmer finally has a son at age 40, he doesn't want to risk losing him. I was pushed away from serving and my dad said, with all the service the BC family has given, one of us can just go to college.
Its a little more complex then just doing my time though. Knowing maybe I could have done something to save one of them and I was at Francies eating a Grinder and drinking Busch Lights and they were in the mix. I know I did my time and did my thing in the infantry. It's just kind of hard to explain.