I think you have to provide a birth certificate for most things except all the secrets this country has plus the nuclear codes. You do not need a BC for that.
We need voter ID in every state before November of 2010 and its time Republicans go on the offensive and stay there!
I also had to show it every once in a while when applying for a job.
But you're right, I guess that you don't need one in order to have the authority to launch nuclear weapons, and have a Top Secret or higher security clearance