How about the French GMCA (Groupement de Commandos Mixtes Aéroportés) commandos during the First Indochina War? These were French SOF types air dropped into the northern part of Vietnam to work with various non-Vietnamese hill tribes who had long standing grudges against the Vietnamese.
After Dien Bien Phu, they were effectively cut off, but many kept on leading their guerilla groups against the Vietminh. No one knows what really happened after 1954, but without resupply, we can assume they were all eventually hunted down.
This site mentions to radio transmissions from trapped GCMA commandos:
http://www.alliedcoldwarvets.com/GCMA.html
The first transmission is also mentioned in Bernard Fall's book Streets without Joy. I like Bernard Fall's translation of the radio transmission, I will post it when I dig up my copy from storage. The second transmission is interesting because it was received by a US Special Forces camp in 1969. One can only imagine what would have happened if they investigated it further.
Mohender, any comments on the GCMA left behind in Vietnam?