Quote:
(B)(i) In carrying out the Commissioner's duties under subparagraph (A) and subparagraph (F), the Commissioner of Social Security shall take affirmative measures to assure that social security account numbers will, to the maximum extent practicable, be assigned to all members of appropriate groups or categories of individuals by assigning such numbers (or ascertaining that such numbers have already been assigned):
Numbers shall be assigned to the maximum practicable extent. Back when I lived in the States, I seem to remember having a couple of non-US colleagues who did NOT have an SSN.