When I was at Takhli, I lived in the brown hootch area, mine was directly across from the chow hall. I remember it well because of "Midnight Chow". What I can't recall is the distance to the perimeter from that location. Also, my work (Air Rescue)was right next to the checkered control tower. With Google Earth, I can see the 2 chopper pad. Using the scale and ruler measuring across the runway to the access rd, I calculate about 325m. Anybody ever measured it. Well within the drift zone-don't know if VA will concede that.
Nice photo of your helicopter next to the tower back when. Now use tower in relationship to perimeter. Put all the pieces together, like a puzzle. Type in Tahkli RTAFB on web, look thru the photos. Most important on your claim, evidence, evidence, evidence. I was approved at Udorn using maps, photos found on the internet. I wrote a 6 page claim. They don't care about the barracks, the VA manual M21-1MR manual clearly states " work duties performed on or near the perimeter. Also be sure to mention army manual on herbicide distances. You may want to type in " VA appeal cititions " on web, type in tahkli and you can see which appeals were won/ loss and why. Gives you a little direction.