I was with 7ACCS (ABCCC) at Udorn in '68 - '69. Before moving across the runway into the Armco-clad revetments, our Herks parked on PSP/dirt at the south end of the runway, across the runway from the Air America ramp. Our squadron area was within a very short walk from the birds. One of our guys from Alleycat, in uniform of course, walked out to check on a bird and the non-English-speaking Thai guard stuck an M1 carbine in his belly button. Fortunately, someone came along and sorted things out, but there was a large pucker factor for a few minutes. Makes a good story now; wasn't at all funny back then.