E.K.
Talk to your mom. See if she can recall what his favorite foods are. Then talk to him and ask him if he is craving something special. Make the entire menu about him even if it is not traditional Thanksgiving fare. Make sure there's enough to sen him home with a substantial care package. The way to a man's heart really is thru his stomach. = )
Hmmm...What else? Is there anything going on in your hometown that you could all attend as family? Any special program at your childhood church or community center? But then, if it were me...An evening at home with all my family and friends (invite his friends over for dessert and drinks after the meal) would be so welcome after what must have been a very intense 5 yrs. Your simple presence is probably gift enough.
Thanks him for his service from me!