If it's not too late, convince your son to joing the Air Force. I think his opportunities are much greater in the USAF and the AF treats its enlistees better. Much better. He'll be safer, too, although many AF personnel do end up in the war zone. This is based on my son's experience as an enlisted man who eventually was accepted to and graduated from the USAF Academy.
PS: Excellent letter.
Thank you for that advice. He actually would prefer the AF, since my father and his 6 brothers were all officers in the AF. He did not do well on the practice test, so it may be easier for him to enter the Army. The math portion apparently kicked his butt and that discouraged him.
The thing that all the services gives one, if one is thinking, is that no matter what situation one is dealt in life, one never-ever-never-ever gives up.