Before you read this: if you're offended at all by this, please feel free to tell us why or go enjoy the rest of TFP. This thread isn't intending to call any TFP member a murderer, but rather explore what "murder" means in the context of war (which I see as a political question).
Murder:
Law. the killing of another human being under conditions specifically covered in law. In the U.S., special statutory definitions include murder committed with malice aforethought, characterized by deliberation or premeditation or occurring during the commission of another serious crime, as robbery or arson (first-degree murder), and murder by intent but without deliberation or premeditation (second-degree murder).
http://dictionary.reference.com/browse/murder
Legally, war usually isn't murder, but what if laws were passed that allowed killing your wife for cheating or killing your children for not obeying? Would those cease to be murder just because they were legal?
I don't think so, and expanding that concept, I'd say that killing in war should be questioned as murder. At what point does killing become murder, or more specifically, at what point does killing become wrong?