Being No. 83, I was as good as gone but just as determined not to go. By then the usual medical tricks were not working. I did not know what I was going to do, but then read a book called 4-F, which explained the process and creative ways people were using to get out of the draft.

From this I developed a theory and created a long record of severe migraine head aches and nausea caused from an incident when I was 6 years old when I had fractured my skull. 

To do this, my pediatrician wrote a letter about my having been nauseous or had headaches, like all kids, even if they were faked to not go to school. Then the doctor at the University of Georgia was very sympathetic and embellished his record of my nausea. Then I went to a specialist who said all this resulted from my fractured skull.
Sure enough, the draft board doctors sent me to their own specialist who supported my "Post Traumatic Headaches" and I received a medical I-Y exemption. 
Fortunately, I do not get headaches!