As for listening to your superiors, that makes a great deal of sense to me. Nothing makes less sense to me than the image of a private talking back to his commanding officer because s/he (are women allowed in the front lines yet?) doesn't want to kill. By protesting commands you are delaying execution of a formulated plan (I doubt heavily that high-ranking officers spend their times thinking completely idiotic ways to kill American infantry), probably endangering your comrades, and very well could be the sole cause of any problems.

I may be hediously unpatriotic, refuse to vote, or even follow every law to the letter, but I know the difference between idle intellectual-peace-time banter and action time. - PG.

It depends. If we're talking about something that I consider just and right, say WW2, then I'd volunteer, do my job and try my hardest. I'd be a lot less likely to question orders if I believed in the war.

Saying that, COs can still get things wrong. WW1 seems to me to be a case of pretty much all the commanders messing up. British soldiers were told to slowly jog over No Man's Land (I think the idea was behind it was to avoid tiring out soldiers before they got to the German lines... the only problem being that most of them were dead by then). I think it's absurd not to question orders like that.