Not sure this impacts a lot of us here, but here is the latest information, for the record.
From: "Agent Orange Review," vol. 26, no.1, Winter 2012 (published by the VA):
"Veterans who served along the demilitarized zone (DMZ) in Korea during the Vietnam war ... in a unit determined by VA and the Dept. of Defense to have operated in an area of the DMZ where AO or other herbicides were applied ..." may apply for AO related benefits if their service was between 1 April 1968 and 31 August 1971 (earlier time period was shorter, between April 1968 and July 1969).
Korean veterans from this expanded service period will also be eligible for participation in the Agent Orange Registry (I have done this): free VA general physical (results entered into national database, for study of long-range AO effects) and ongoing receipt of above "Review."
Also about
AO, perhaps not as widely known, if a Vietnam or Korean veteran (male or female) has a child with certain birth defects (especially spina bifida), that veteran is eligible for benefits. The benefit is presumptive, that is, the VA assumes that the birth defect is service related (making it easier to apply for and get benefits).
For more information:
www.publichealth.va.gov/exposures/agentorange