Unusual.
Typically during joint-combined Thai-US exercises, like Cobra Gold, American aircraft are prohibited from flying within 10 miles of the borders (Lao, Cambo, Myanmar). Evidently, an exception was granted for this site survey.
Looks like two helos arrived, and neither had fuel to return, so they topped off one and the other remained overnight. If the servicemen were indeed Air Force, they were likely combat controllers -- there to do an airfield survey for landing C-130s in the event Myanmar gives the green light. Mae Sot seems a logical place to stage relief efforts.
And they were probably looking for more than a place to stay.
