With his permission you can.
No, not if he is the other person that has legal custody.
You divorce and get custody over your kids or just get full custody!
Boyfriend or husband (unless he is the biological father) has no legal right to the child at all. The mother can try to go for full custody though.
You can re-file in Family Court to amend the Full Custody and Support Order.
Why shouldn't he if she goes on deployment?
no
Welfare will help in obtain child support and/or state aid.
It depends on your state's custody laws. For example, California is a "mother state" where the only way a mother can be denied full custody of her children is if she is so grossly unfit that she is institutionalized. Other states may prefer the father, but generally very few states have a non-gender-biased ideal behind custody laws.
Yes, they have an assumption of sole custody in every state except Arizona.
No. If the child's' mother calls the police you could loss custody of your child and possible go to jail. If I was you I would contact a lawyer who specializes in child custody cases. If you can get a notarized letter from the mother saying it is okay and giving you full custody.
Yes, this could happen.
per my knowledge a child born during the marriage is both party's child as where he may not get full custody he maybe able to get join custody