Hi Judy...
My father was in Nam those same years and was also exposed to agent orange. Although my dad (age 65) has never had cancer, he does have a loss of teeth. It might be a result of agent orange combined with a lack of good dental care. As for the ringing in the ears, many vets have this...including my father. That might be a result of the loud guns and bombs going off. My father also uses VA, but I'm not sure what they cover and what they don't cover.
My husband was dx last year with stage 3 tonsil cancer (age 47,non-smoker/non-drinker). We were told by a doctor at the Mayo Clinic in MN that he would try surgery first in hopes that they would get it all the first time (and followed by radiation), but he told us if they did do surgery first there would only be an 11% chance they would get it all. We ended up choosing a hospital in Miami and going with radiation/chemo and no surgery was ever needed.
My husband is doing very well. Treatment ended in late Feb.this year. His taste is almost 90% back and saliva is about 80% returned, and the cancer is gone.