I am now a member of the American Society of Naval Engineers. They sent me a certificate and everything; I just got it in the mail. ASNE was established in 1888. I'm feeling rather honorable and historic at this particular moment, I must say.
I don't really know... we just bought memberships when we were going to their HSI conference anyway, so I'm not sure that there are any actual qualifications. However, I am in fact an engineer, and I am in fact working on a Navy contract, so that probably didn't hurt.