I don't think the hospital will insist on you having a family member there as such, some people fall pregnant split from the father and have no other support themselves. It happens alot. You meet a doula prior to birth anyway so they have no idea if she is an actual friend or not.

Just makes sure DF pre-warns the Army that you are due for birth around the end of training. I am sure they will understand, he wouldn't be the first father to be

Love