'...Haunting choices..." is the 'mot juste' . I've seen both the Hurt Locker and AS. And I agree with B.Bill 's views
The work of a sniper, of course, is quite the opposite of that carried out by that of weapons of mass killing. Snipers seek out specific individual targets, usually enemy officers - the very antithesis of indiscriminate slaughter.
Smiddy makes a valid point. My view would be to refer to them as protagonist and antagonist depending on where one's sympathies/loyaties lie.As for cowards and heroes- imo, it's situational .One's control on fear or lack of it in a given scenario. Let's say a person sees his friend drowning, But for reasons known only to him, doesn't go out to rescue him. The same person ,on the other hand rushes into a burning building to rescue a baby while sustaining severe burns.
There is the motivation factor. Is one willing to die for a cause? The movie brings out the dichotomy in the mental makeup between the two brothers. While one feels the cause is worth dying for the other wants to end it and go home.Subjectivity ,too, plays a big part in deciding who is which in any given situation. My personal view is - I'm sitting in my favorite couch wrapped outside of a cozy drink and an aromatic cigar. The Al Quaida, ISIS , are unrelenting in their efforts to enslave all into their idea of what the world should be -at gunpoint!!. The American marines and all members of the American armed forces have my undying gratitude ,respect and honor for doing what they do - for keeping me safe from circumcision and making that cozy drink, couch and the Cuban possible !!