My dads experience is also effected by the fact that he was in a Pershing Nuclear Missile unit. A Pershing Battalion had about 1600 men and because of the jobs had lots of college educated draftees. My father says most were happy to be there rather than in Viet Nam, and most wanted clean records when they got home.
Your dad's experience was atypical I think because the people chose for those units most likely had to undergo psychological screening because of being involved with nuclear material. When I was in they called it the Personnel Reliability Program. Personnel in those units were a higher caliber because they had to be..