First off...King Kong blows beyond any measurable method of suck.
Yes I know I'm rambling on but for one reason or another when a film maker, Jackson in particular does this quite often, have military personal on film they're often laughable and amateur at best. Obviously meant to be unlikeable cannon fodder for the protagonist to waste willy nilly without the audience feeling appalled at the visual obliteration, but broken down its just a petty story telling trick. I must say I do feel cheapened when such a trick is pulled. The argument I guess being that, well these are not national military they're evil bad mercenaries who kill for pleasure and money and "plot to take over zee world!". Again a story telling shortcut and a bland one at that. At this point your better off as a story teller with your antagonist as cardboard cut outs with "bad guy" written across them.
For me if your going to show military personnel you better do it right. Let me set this strait this does NOT mean a heroic image as this is another bitter bite in story telling; but actual competent complex human beings. Anger, humor, sadness, excileration etc, things that give a character actual depth. Even given that the men portrayed are in the private sector. If you take the time and actually look into the real world of private military contracting, you will find most of the guys in the business are not evil. No doubt their are bad seeds as you find in any organization right down to bloody Green Peace. Most of the guys are simply ex-military or ex-law enforcement trying to make an actual living with the skill trade they have. Most have a very professional attitude and make an effort to complete their contracts with efficiency. Yes PMC's profit from war and destruction as does any other organization in conflict zones.
So what have we learned, first off as far as this film's story telling methods are concerned they choose some cheap and petty methods, private military is not this great evil plague and if you are such a contractor on a contract to patrol an urban center with a large alien presence bring a lot of capable friends with big guns, armor and proper air support.