...I can think of is to call his unit in the States. There'll be a rear detachment & maybe they'll tell you. Normally they keep individual troop movements fairly secret but if you explain the situation it'll help. If he's a Ranger or in Special Forces they won't give you the time of day but try anyway.
Don't worry about them notifying you. He'll be just fine. When you call his stateside unit tell them to make sure that you're on the notification list.
I took so long to answer you because I wasn't sure & hoped someone who knew answered first. Sorry to keep you hanging, PYates.