BS that a man's not supposed to cry, we have emotions too. Sean is doing a great service, of course you know that. I'm sure his training from you and your wife and the military will serve him well, he'll do his job to the best of his abilities and come back and make you even more proud than you are now!
Just a thought, but you could always send him the link to this thread when he gets there so he can read it and know that he's in the thoughts and prayers of more than just his immediate family. God speed Sean!