Hi. I was station at Takhli as a aircraft mechanic from Sept. 1966 to Sept. 1967. I also was a augmentee security guard. Like you and perhaps most other augmentees we were never issued orders to that effect. The only "proof" I have to show I was indeed a augmentee is a weapons card that was issued to me. Without some doucmentmented proof if may be hard to prove you were a augmentee security guard. Good luck!