Pub. L. 85-857, tit. 38, pt. VI, ch. 85, subch. II, sec. 5228
Investment of the Fund
§ 5228. Investment of the FundMoney 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.