Sand
Footballguy
"Selective Service bases the registration requirement on gender assigned at birth and not on gender identity or on gender reassignment. Individuals who are born male and changed their gender to female are still required to register. Individuals who are born female and changed their gender to male are not required to register."No, not deliberately. I really don't see anything about a birth certificate. I can't rule out the idea that sex is determined by other means for purposes of required registration.
Even if a birth certificate is currently used, I'm not convinced that's the most sensible thing to go by.
From the SSS FAQ.