Not saying it's impossible but given the choice between you and a US citizen they will nearly always choose the latter and claim security considerations post 9 -11.
Not saying you're wrong, but do you have any facts to support that? I haven't seen any evidence to suggest that it will be a problem.
It's almost a moot point anyway, because by the time he's eligible to get to a major, he'd have been a resident for way more than the required 5 years.