38 U.S.C. § 8528
Investment of the Fund
Money in the Fund not required for current disbursements may be invested and reinvested by the Secretary of the Treasury in interest-bearing obligations of the United States or in obligations guaranteed as to both principal and interest by the United States.
( Pub. L. 85–857 , Sept. 2, 1958 , 72 Stat. 1262 , § 5228; renumbered § 8528, Pub. L. 102–40, title IV, § 402(b)(1) , May 7, 1991 , 105 Stat. 238 .)