I’ve already told my nephews not to sign up for the military
For the best. If they share your beliefs and affiliations, they would not be eligible to enlist.
You don't want them to serve for the Military–industrial complex. That said. I have a lot of respect for our military. Our bravest were able to assassinate Osama bin Laden. Obviously, that cause was just. But our leaders are not always using our soldiers wisely. They see them as cannon fodder.