Tom Clancy is still probably trying to figure out what happen to his franchise.
Apparently Ubisoft never red any of his books and can't keep the story straight. Rainbow Six, which has six characters, has became Ghost Recon, which has three, and Ghost Recon has become Rainbow Six according to this movie preview. There looked to be plenty more than 3 Ghost Recon soldiers in that setting. However, there did appear to be six. So it could possibly be better served to say this is a movie about the first Rainbow Six video game for the PC. They just got the naming wrong.
What the heck happened to having six characters in Rainbow Six? It's called Rainbow "Six". Did I miss something.