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):
(I)#
to aliens at the time of their lawful admission to the United States either for permanent residence or under other authority of law permitting them to engage in employment in the United States and to other aliens at such time as their status is so changed as to make it lawful for them to engage in such employment;
(II)#
to any individual who is an applicant for or recipient of benefits under any program financed in whole or in part from Federal funds including any child on whose behalf such benefits are claimed by another person; and
(III)#
to any other individual when it appears that he could have been but was not assigned an account number under the provisions of subclauses (I) or (II) but only after such investigation as is necessary to establish to the satisfaction of the Commissioner of Social Security, the identity of such individual, the fact that an account number has not already been assigned to such individual, and the fact that such individual is a citizen or a noncitizen who is not, because of his alien status, prohibited from engaging in employment;
(IV)#
to or on behalf of children who are below school age at the request of their parents or guardians; and
(V)#
to children of school age at the time of their first enrollment in school.