I would point out that the Marines in Avatar were actually PMC's. They all came from the Marines but they worked for the company. This is very similar (but different) to Alien's where the government hired out the Marines to a corporation. The interesting sub-text (sic) that hasn't been discussed is that the paralyzed veteran could not get treatment, but the company would provide that treatment. NOBODY is looking at that little bit of the story line which has a huge impact on the story arc. I'm going to see it again before I decide if I'll fully review it.