Incidence of Parkinson's in G.I..'s who served in Korea.

I have posted before that I have Parkinson's disease (P.D.). I recently found out that my sister's brother-in-law also has it. He served as an M.P. in Korea about 1968-1972, exactly where I never heard. . Has anyone heard anything about the incidence of P.D. in GIs that served in Korea?
There is a history of P.D. in his family, his mother and his mother's father.
What is the incidence of P.D. in the general population in Cambodia-Laos-Viet Nam area? Don't recall anyone raising that subject.

 

There has been some research done with regards to Korean vets serving in Vietnam...

VA site indicates that Parkinson's may be a claimable ilness for Vietnam vets exposed to Agent Orange (and possibly other herbicides) YMMV

Parkinson's Disease and Agent Orange - Public Health

For Veterans and Family - Parkinson’s Disease Research, Education and Clinical Centers

VA Disability Compensation for Veterans with Parkinson’s | APDA

A sampling of resources for vets with Parkinson's disease ralated to their military service.
Resources for Veterans with Parkinson’s Disease

Veterans Benefits

How to Win Disability Benefits with Parkinson’s Disease

How MJFF Advocates for the 80,000 U.S. Veterans with Parkinson’s Disease

How does the VA rate Veterans Parkinson's Disease?