Anti-parrallel thoughts

When you go and watch a movie, you see the hero overcome all the odds and save the world, often getting the girl and saving everyone.
Well, I always believe that such an ending is so implausible.
In war, there has to be some collateral damage.
And I cringe everytime the hero surrenders to save a small group of people.
Isn't that compromising the mission?
A commando is trained to be brutal, ruthless, and emotionless. In short, a cold blooded machine.
If one is blinded by emotions, he will never be able to carry out such a complicated and important job.
My challenge is to write a story about the absolute anti-hero, one who is drastically different from the archetypal self-sacrificing, honourable hero. I want him to fight dirty, not be confined by the beliefs of honour, able to accept that collateral damage is necessary, and if he needs to sacrifice a small number of people for the greater good, he would. In short, he would be the most efficient hero.
I have only written two chapters of my ambitious 23 chapter epic, but will most likely never see the light of day.
The anti-hero is more real than any of the hollywood heroes.
They are around us.
They are the SAF.