; or (2) any amount in the account of an individual in the Thrift Savings Fund which, as of the date on which paragraphs (1) and (2) of subsection (a) are first met with respect to such individual, is nonforfeitable. (f) Regulations Any regulations necessary to carry out this section may be prescribed— (1) except as provided in paragraph (2), by the Director of the Office of Personnel Management; and (2) to the extent that this Act relates to the Thrift Savings Plan, by the Executive Director (as defined by section 8401(13) of title 5, United States Code).