During the Vietnam war, men who should serve just didn't, hiding or something else. Are there any numbers as to how many men should have served but didn't? Also, is there some information about what were the most common ways to avoid it? Lastly, what was the supposed punishment for these cases, and are there any statistics as to how many were actually punished in that way?
There were so many ways of "avoiding" the draft that the answer will never be found. Look up information on teacher surpluses, grad school enrollments, expansion of the National Guard and the Reserves, Canadian immigration, and defence industry jobs for starters. Draft card burnings never seemed to have the fuel examined before the match was applied. As a fun thing to do, check out how many people have been convicted of financial crimes and whether they fit the demographic that includes young men of that age. You might be surprised.