I guess the "buying for immediate family" is now considered a straw buy? Last time i read that law, it wasn't. I only went to read it 2 years ago because when my daughter bought her g3c, i seen a shotgun i wanted but didn't have the cash, so 3 weeks later she bought it for my birthday.This is very bad advice that could land somebody in prison. Do not attempt to circumvent the law by selling to a family member knowing that the actual intended recipient is someone else that you can't (or think you can't) legally sell to. In this case the seller is already privy to the information, and intent is established. He has a legal and moral obligation to do it right. I'm not a dealer and don't know the legalities of a private sale to an active duty military member, but I do know that facilitating a straw purchase is a huge no-no.
I agree with @Tactically Fat...best approach if you're not feeling confident about it would be to have a local FFL facilitate a transfer. It sucks to have to pay the fee and jump through the hoops, but IMO the $30-$50 is worth the peace of mind to know that you're not going to end up spending a couple of years sharing a cell in BOP with Bubba!