The problem with this line of thinking is that war cannot and will never prepare someone for dealing with a teenager who doesn't want to do something. War has a certain amount of logic to it. Teenagers, not so much.

And so Luke mulishly sits and looks sullen. Through the entire rest of the meeting. Not a single note. He actually pays attention to a good chunk of the information being presented, but he makes a damned good show of sullen indifference.

It's a role he's had a lot of practice with thanks to his constant bickering with Owen.