Found a partial answer to my question on-line. In February, 2010 the VA added a bunch of destroyer/frigate type ships to the eligible list because they were drawing contanimated water from inland and bay areas of Viet Nam. No mention of carriers. There is a bill in congress right now that would extend eligibility to everbody that was there whether on land, in the air, or at sea. We shall see what happens. Agent orange has apparently caused cancer in one hell of a lot of veterans. Squid.