I also have MG and have a medical specialist state it was a greater that 50% chance it was caused by Agent Orange. Today I got a rejection letter from the VA denying my claim as it did not manifest itself prior to discharge. I even included in my claim copies of court cases (VA) where claims were approved yet they still denied it. I have been fighting them for five years and the VA motto seems to be , Deny, Deny until they die. They want the Veteran to provide medical evidence and/or studies that prove your case.