An argument that didn't work for the Nazis at Nuremberg. That didn't work for Calley at My Lai. In Army Basic Training (at least when I went through it in 1986) we were given an entire afternoon of classes called "Roll of the Army". And we were told in no uncertain terms that if we were given an unlawful order, we had a legal, moral and ethical duty to disobey it.

Killing children in a country we were "liberating" seems pretty illegal.

I don't really care what the DSM-V classified Chris Kyle as. He enjoyed killing people. Not the most socially-acceptable trait a human being should really possess, no matter who makes excuses for their behavior.

And your position is not as well thought-out as you seem to think. I loathe Chris Kyle, so naturally I loathe all Navy SEALS and all of the good things they do? That's one of the worst logical fallacies out there.

An innocent child just trying to walk down the street in Ar-Ramadi is the same as Osama Bin Laden?

No......I really don't think so.