I don't know - it doesn't seem like it has to be an either/or situation, since they both seem to want to serve in the military so badly. They can still be in the army ( navy, whatever - I forget which branches they said they were in) and serve overseas and not serve on the front line. I know several people in the military who aren't in Iraq or Afghanistan. That way, they can do their duty the same as everyone else and not further endanger the lives of everyone around them, which should be the first concern. Wasn't William doing practices awhile back trying to catch drug runners or pirates or something like that?
I have to say - I like them both, but seeing as they both have big targets painted on their back, I wouldn't want to be the one standing next to them in a battle, for fear I'd have one painted on my back, too.