chug,
Not going to enter into a debate about the basis of the war today, sorry. Regardless of what this young gent thinks about it, he is a member of the US military and the proper US legal and executive branches ordered him to go. If he's strong enough to stand for his beliefs, then a thumb's up to him for that, however, he took Uncle's dollar, he's obligated to go.
rm,
My point regarding the Lt is that under US UCMJ, which he voluntarily put himself under by taking his commission, he is most likely headed for a military cell.
International law would not have priority (not sure what the correct legal term for superseding one set of laws over another, sorry.) over an internal US proceeding which this Lt's court-martial most certainly will be.