Albert,
If you have an official commendation letter about you working on a crashed B-66 that went off the runway that would be /should be solid evidence that had you working on or very near the runway if not on the runway or overrun at the end. Couple that with aerial photos of Takhli showing proximity of the runway to the East perimeter and indicate where you were working when recovering the crashed B-66. Use the aerial photo from the CHECO report along with one or more Google Earth photos of present day Takhli RTAFB. THe flightline areas are virtually unchanged from the time you were stationed there. The Google Earth photos have distance scales that you can use to show distances between the perimeter and the area you worked in. You can draw a distance scale on the CHECO photo using the distance between the runway and taxieway as a guide. If you're not using a VSO such as one from DAV or VFW to help you present stuff to the VA I highly suggest you do so. Doesn't cost you a dime and they will be a BIG help.
If you want me to send you the CHECO and Google photos I referred to then post your email address in response and I'll send them to you.
Also, I was a augmentee at Takhli too. Nothing in my records show that.

...Dennis