Personally, I would rather have a child in the Israeli army than in a secular college in the USA. (been there, done that)
If you MAKE him do anything, he will resent you for the rest of your life.
Some suggestions to make to him; university in Israel?
Nachal Chareidi? Golani?
Does he want to go into a Hesder program, or the “american program”?
You need to find our which part of the army he wants to go into. That will give you some insight into his decision/path in life.
Hatzlacha