When put in the context of the geneva convention, I suppose you can.
Are the people that they killed enemy 'soldiers', ...or are they innocent civilians? I'm not speaking of "collateral damage". I'm talking about targetting civilians in cold blood. Military is charged with fighting and killing military personnel on the other side, ...not innocent civilians. To do so in a country like Iraq, is akin to aiding & abetting the enemy, because you're going to radicalize a whole group of people who otherwise would not have taken up arms against your own soldiers, ...so ya, charge them with murder AND myopic stupidity. There is a code of conduct they must follow.