RAMBO II
The first military unit in warfare history that used the HALO parachute jump (High Altitude - Low Opening), was the MacVsog, in Vietnam.
The adventurous jump in the beginning of the second Rambo movie (despite the fact that it's a standard jump, not a HALO one) is some kind of fictional tribute to the dangers that SOG soldiers put themselves into when they used HALO jumps for the very first time in war.
Every SOG soldier could really speak Vietnamese, just like Rambo does during the movie. The language course was standard during SOG training.
Language knowledge was necessary to fight together with local forces. If captured, SOG soldiers used to pretend they couldn't understand the Vietnamese, so that they could listen to their guard's conversations without them having any clue about it.