You can request a VA Agent Orange Registry health exam. Even if you don't have a known illness, the exam could alert you to illnesses that may be related to contact with herbicides.
Alright. How do I know if I qualify for such an exam?
You must have either served in Vietnam between 1962 and 1975 for any length of time, including in the inland waterways Brown Water Navy and within the 12-mile territorial seas Blue Water Navy, or in Korea in a unit in or near the Demilitarized Zone (DMZ) anytime between April 1, 1968, and August 31, 1971.
I see. What are you going to examine then?