Your son and your family are in my prayers. You should feel very proud, you've instilled patriotism and love of country in your boy and you just don't see a lot of that today.
I spent 6 years in the Army Special Forces and never gave much thought about how my decision would affect my family. I'm now a parent, and even though he's only 8, I can't imagine what you, my parents and many other parents go through when it comes to a decision, such as the military.
Many times we call our men and woman in the armed forces heroes and patriots and they are, but I believe that parents, such as yourself are as well.
God bless your son and your family and I hope he enjoy's his tour.