There is a substantial part of "Street Without Joy" dedicated to this Groupe Mobile. Goes into detail about its origin, its operations, and its end. It really was very interesting.
As to the previous discussion on Vietnam and communism and all; I think it was Kilcullen said that (paraphrasing) Malaya was "won" not through the application of some "special COIN tactics" (though COIN tactics were obviously necessary), but because the British started to implement the policies which the insurgents were using to rally the population, so that only hardliners really had any reason to continue fighting (provided the British left in the end). As to Vietnam, France and then the US after them tried to implement the obvious COIN tactics (destroy morale of the enemy and its support among the population, secure rear logistics, lots of intelligence and counterintelligence (specially from natives), gain support from the population, isolation of the enemy like fish from water like strategic hamlet program, etc), but they couldn't have brought themselves to implement the necessary policies to really gain the required support, too much vested interest in status quo. Mm, just my opinion, really agree with Nickfury.
As to the movie, it isn't the legion, as Peter Lyderik pointed out. And it really isn't very good at all, the movie; half-decent action sequences and sloppy sentimentality, me thinks.
Can't tell
