In response to the Institute of Medicine’s report on Post-Vietnam Dioxin Exposure in Agent Orange-Contaminated C-123 Aircraft from the National Academy of Sciences, we have determined there is evidence of exposure to Agent Orange for Airmen who worked on C-123s that were used in Vietnam as part of Operation Ranch Hand. Specifically, we have determined there is sufficient evidence that Air Force and Air Force Reserve members who served during the period 1969 through 1986 and regularly and repeatedly operated, maintained, or served onboard C-123 aircraft (known to have been used to spray an herbicide agent during the Vietnam era) were exposed to Agent Orange.

http://www.benefits.va.gov/COMPENSATION/AgentOrange-C123.asp