I have the same problem I was tdy to Clark AFB in February 1968 for 2.5 months. 8 C-130's from pope and 8 from Dias an "EST" team from Pope and the one I was on from Langley. I flew incoutry on sereral occations to drop off supplies and bring troops out. One of the loads we took on several trips was barrels of AO. I submitted to the VA for Ischemic Heart Disease. because I had a heart attack in 1983, triple bypass in 1994 and three stints in 2008. I just receaved a reading from the VA saying that they have no record of me being in country and was denied my claim. So I am trying to establish some proof also.