Child custody and the military, and deployment of parents with custody, are complicated issues in the United States. If your spouse has custody of her child from a previous relationship and that parent has any rights, she will need the court's permission to move with the child if you join the military and get stationed elsewhere. The laws vary in different states. You should consult with an attorney in your jurisdiction who specializes in child custody issues especially as they are affected by military service.

The Supreme Court Justice of the Government enforces custody laws. They make sure that people that do bad things are held in jail, especially if it harms others.

Legally, yes, but actually collecting that support will depend on what agreement the two countries have about child support and the persistence of each bureaucracy.

There are a total of about 100 serial killers in custody, in the United States.

Yes, custody laws can vary drastically from state to state. You can look up your states' custody laws via the internet.