Congratulations Terry ,I personally think you did what you did at the time sincerely and that's what counts. It shows what good qualities you had when young even if the cause was wrong.
My story was from another angle in those days ,I actually joined the navy at 17 ignoring my fathers request not to. You see he was a bomber in the RAF from 39-45 the whole duration and had taught me the evils of war from a young age. I wanted to see the world and put aside my anti war feelings for that ,joined and soon learned what being at war meant and it was real and I realised my mistake.
I came forward as concientious objector and the navy gave me hell ,threatened jail but they got rid of me with the optional discharge squad (you could optionally leave the service after a qualifying period)
Glad I did'nt kill any Vietnamese people and so was my dad and still proud of my stand to this day.
You stuck to your principles at that time and the motivation from your heart was the thing that mattered.